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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	May 01, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Entity Registrant Name	SolarEdge Technologies Inc
Entity Central Index Key	0001419612
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		45,010,758.000

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 229,219	$ 163,163
Restricted cash	1,766	1,516
Marketable securities	81,229	77,264
Trade receivables, net	127,479	109,528
Prepaid expenses and other accounts receivable	33,156	42,223
Inventories	98,363	82,992
Total current assets	571,212	476,686
LONG-TERM ASSETS:
Marketable securities	88,554	103,120
Property, equipment and intangible assets, net	61,161	52,297
Prepaid expenses and lease deposits	787	862
Deferred tax assets, net	9,847	8,340
Total long term assets	160,349	164,619
Total assets	731,561	641,305
CURRENT LIABILITIES:
Trade payables, net	83,091	69,488
Employees and payroll accruals	29,733	22,544
Warranty obligations	16,605	14,785
Deferred revenues	3,010	2,559
Accrued expenses and other accounts payable	26,170	20,378
Total current liabilities	158,609	129,754
LONG-TERM LIABILITIES:
Warranty obligations	71,590	64,026
Deferred revenues	41,866	31,453
Lease incentive obligation	1,690	1,765
Non-current tax liabilities	17,595	16,840
Total long-term liabilities	132,741	114,084
STOCKHOLDERS' EQUITY:
Common stock of $0.0001 par value - Authorized: 125,000,000 shares as of March 31, 2018 (unaudited) and December 31, 2017; issued and outstanding: 44,897,108 and 43,812,601 shares as of March 31, 2018(unaudited) and December 31, 2017, respectively	4	4
Additional paid-in capital	343,356	331,902
Accumulated other comprehensive loss	(1,135)	(611)
Retained earnings	97,986	66,172
Total stockholders' equity	440,211	397,467
Total liabilities and stockholders' equity	$ 731,561	$ 641,305

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, authorized shares	125,000,000	125,000,000
Common stock, issued shares	44,897,108	43,812,601
Common stock, outstanding shares	44,897,108	43,812,601

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 209,871	$ 115,054
Cost of revenues	130,274	76,378
Gross profit	79,597	38,676
Operating expenses:
Research and development	17,875	11,458
Sales and marketing	16,205	10,775
General and administrative	4,689	4,439
Total operating expenses	38,769	26,672
Operating income	40,828	12,004
Financial income, net	584	1,410
Other expenses	64
Income before taxes on income	41,348	13,414
Taxes on income (tax benefit)	5,662	(761)
Net income	$ 35,686	$ 14,175
Net basic earnings per share of common stock	$ 0.81	$ 0.34
Net diluted earnings per share of common stock	$ 0.75	$ 0.32
Weighted average number of shares used in computing net basic earnings per share of common stock	44,231,679	41,348,225
Weighted average number of shares used in computing net diluted earnings per share of common stock	47,673,522	43,837,505

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 35,686	$ 14,175
Other comprehensive income (loss):
Changes in unrealized gains (losses), net of tax expense (benefit)	(510)	28
Net change	(510)	28
Cash flow hedges:
Changes in unrealized gains, net of tax expense		909
Reclassification adjustments for gains and losses, net of tax expense included in net income		(395)
Net change		514
Foreign currency translation adjustments, net	(14)	(243)
Total other comprehensive income (loss)	(524)	299
Comprehensive income	$ 35,162	$ 14,474

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows provided by operating activities:
Net income	$ 35,686	$ 14,175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and intangible assets	2,430	1,520
Amortization of premiums on available-for-sale marketable securities	778	383
Stock-based compensation	6,849	3,612
Deferred tax assets, net	(1,321)	(1,333)
Loss on disposals of fixed assets	64
Changes in assets and liabilities:
Inventories	(15,348)	6,453
Prepaid expenses and other accounts receivable	9,210	(4,583)
Trade receivables, net	(17,935)	(8,070)
Trade payables, net	13,595	9,734
Employees and payroll accruals	7,153	(1,272)
Warranty obligations	9,384	2,750
Deferred revenues	6,981	2,060
Accrued expenses and other accounts payable	6,527	311
Lease incentive obligation	(74)	(74)
Net cash provided by operating activities	63,979	25,666
Cash flows used in investing activities:
Purchase of property and equipment	(11,325)	(1,872)
Increase in short and long-term lease deposits		(66)
Investment in available-for-sale marketable securities	(25,436)	(24,070)
Maturities of available-for-sale marketable securities	34,500	15,665
Net cash used in investing activities	(2,261)	(10,343)
Cash flows from financing activities:
Proceeds from issuance of shares upon exercise of options	4,605	371
Net cash provided by financing activities	4,605	371
Net increase in cash, cash equivalents and restricted cash	66,323	15,694
Cash, cash equivalents and restricted cash at the beginning of the period	164,679	105,580
Effect of exchange rate differences on cash, cash equivalents and restricted cash	(17)	(350)
Cash, cash equivalents and restricted cash at the end of the period	$ 230,985	$ 120,924

GENERAL

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

GENERAL

NOTE 1:-

GENERAL

SolarEdge Technologies, Inc. (the “Company”) and its subsidiaries design, develop, and sell an intelligent inverter solution designed to maximize power generation at the individual photovoltaic (“PV”) module level while lowering the cost of energy produced by the solar PV system and providing comprehensive and advanced safety features. The Company’s products consist mainly of (i) power optimizers designed to maximize energy output from each and every module through constant tracking of Maximum Power Point individually per module, (ii) inverters which invert direct current (DC) from the PV module to alternating current (AC); (iii) a related cloud-based monitoring platform, that collects and processes information from the power optimizers and inverters of a solar PV system to enable customers and system owners as applicable, to monitor and manage the solar PV systems; and (iv) a storage solution that is used to increase energy independence and maximize self-consumption for homeowners by utilizing a battery that is sold separately by third-party manufacturers, to store and supply power as needed (the “StorEdge solution”). The StorEdge solution is designed to provide smart energy functions such as maximizing self-consumption, Time-of-Use programming for desired hours of the day, and home energy backup solutions. In addition, the Company offers several communication and smart energy management solutions.

The Company and its subsidiaries sell their products worldwide through large distributors and electrical equipment wholesalers to smaller solar installers, as well as directly to large solar installers and engineering, procurement and construction firms (“EPCs”).

New accounting pronouncements not yet effective:

In February 2016, the FASB issued ASU 2016-02, “Leases” (Topic 842), whereby lessees will be required to recognize for all leases at the commencement date a lease liability, which is a lessee‘s obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. A modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements must be applied. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Companies may not apply a full retrospective transition approach. ASU 2016-02 is effective for annual and interim periods beginning after December 15, 2018. Early application is permitted. The Company is evaluating the potential impact of this pronouncement.

Recently issued and adopted pronouncements:

In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). Under the new standard, revenue is recognized when a customer obtains control of promised goods or services and is recognized in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flow arising from contracts with customers. The guidance permits two methods of modification: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method.). The Company adopted the new standard, effective January 1, 2018, using the modified retrospective method applied to those contracts which were not substantially completed as of January 1, 2018. See “Revenue Recognition” below for further details.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which provides guidance with the intent of reducing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The Company adopted ASU 2016-15 during the first quarter of 2018. The adoption of this new guidance had no impact on the Company’s condensed consolidated balance sheets, statements of income and cash flows.

In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers Other than Inventory (ASU 2016-16), which requires companies to recognize the income-tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than when the asset has been sold to an outside party. The Company adopted ASU 2016-16 during the first quarter of 2018. The adoption of this new guidance had no impact on the Company’s condensed consolidated balance sheets, statements of income and cash flows.

In November 2016, the FASB issued Accounting Standards Update No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18), which requires companies to include amounts generally described as restricted cash and restricted cash equivalents in cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted ASU 2016-18 during the first quarter of 2018. The adoption of this new guidance had no material impact on the Company’s condensed consolidated balance sheets, statements of income and cash flows.

In May 2017, the FASB issued ASU 2017-09, "Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting." ASU 2017-09 was issued to provide clarity and reduce both 1) diversity in practice and 2) cost and complexity when applying the guidance in Topic 718 to a change in the terms or conditions of a share-based payment award. ASU 2017-09 provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting under Topic 718. The Company adopted ASU 2017-09 during the first quarter of 2018. The adoption of this new guidance had no impact on the Company’s condensed consolidated balance sheets, statements of income and cash flows.

Revenue Recognition:

The Company adopted Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606), effective on January 1, 2018. As a result of this adoption, the Company revised its accounting policy for revenue recognition as detailed below.

The Company and its subsidiaries generate their revenues mainly from the sale of power optimizers, inverters and cloud-based monitoring services to distributors, installers and PV module manufacturers.

The Company applies the provisions of ASC 606, Revenue from Contracts with Customers, and all related appropriate guidance. The Company recognizes revenue under the core principle that transfer of control to the Company’s customers should be depicted in an amount reflecting the consideration the Company expects to receive in revenue. In order to achieve that core principle, the Company applies the following five-step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when a performance obligation is satisfied.

(1)

Identify the contract with a customer

A contract is an agreement between two or more parties that creates enforceable rights and obligations. In evaluating the contract, the Company analyzes the customer’s intent and ability to pay the amount of promised consideration (credit risk) and considers the probability of collecting substantially all of the consideration. Deferred revenues or allowance for doubtful debt is recorded based on the Company’s analysis.

The Company determines whether collectability is reasonably assured on a customer-by-customer basis pursuant to its credit review policy. The Company typically sells to customers with whom it has a long-term business relationship and a history of successful collection. For a new customer, or when an existing customer substantially expands its commitments, the Company evaluates the customer’s financial position, the number of years the customer has been in business, the history of collection with the customer, and the Customer’s ability to pay, and typically assigns a credit limit based on that review.

(2)

Identify the performance obligations in the contract

At a contract’s inception, the Company assesses the goods or services promised in a contract with a customer and identifies the performance obligations.

The main performance obligations are the provisions of the following:

Power optimizers

Inverters

Storage solution

Cloud based monitoring services

Extended warranty services

Communication services

(3)

Determine the transaction price

The transaction price is the amount of consideration to which the Company is entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties.

Generally, the Company does not provide price protection, stock rotation, and/or right of return. The Company determines the transaction price for all satisfied and unsatisfied performance obligations identified in the contract from contract inception to the beginning of the earliest period presented.

Rebates or discounts on goods or services are accounted for as variable consideration. The rebate or discount program is applied retrospectively for future purchases. Provisions for rebates, sales incentives, and discounts to customers are accounted for as reductions in revenue in the same period the related sales are recorded.

When a contract provides the customer with payment terms of more than a year, the Company considers whether those terms create variability in the transaction price and whether a significant financing component exists.

The performance obligations that extend for a period greater than one year are those that include a financial component: (i) warranty extension services, (ii) cloud-based monitoring, and (iii) other communication services.

(4)

Allocate the transaction price to the performance obligations in the contract

The Company performs an allocation of the transaction price to each separate performance obligation, in proportion to their relative standalone selling prices.

(5)

Recognize revenue when a performance obligation is satisfied

Revenue is recognized when or as performance obligations are satisfied by transferring control of a promised good or service to a customer. Control either transfers over time or at a point in time, which affects when revenue is recorded.

Revenues from sales of products are recognized when control is transferred (based on the agreed International Commercial terms, or “INCOTERMS”). Revenues related to warranty extension services, cloud-based monitoring, and communication services are recognized over time on a straight-line basis.

Deferred revenues consist of deferred cloud-based monitoring services, communication services, advance payments received from customers for the Company’s products, and warranty extension services, and are classified as short-term and long-term deferred revenues based on the period in which revenues are expected to be recognized.

The most significant impact of the standard on the Company’s financial statements relates to advance payments received for performance obligations that extend for a period greater than one year. Applying the new standard, such performance obligations are those that include a financing component, specifically: (i) warranty extension services, (ii) cloud-based monitoring, and (iii) other communication services.

The Company recognizes financing component expenses in its condensed consolidated statement of income in relation to advance payments for performance obligations that extend for a period greater than one year. These financing component expenses are reflected in the Company’s deferred revenues balance.

The effect of the changes made to the consolidated January 1, 2018 balance sheets following the adoption of ASC 606, Revenue - Revenue from Contracts with Customers were as follows:

	Balance as of December 31, 2017		Adjustments due following adoption of ASC 606			Balance as of January 1, 2018
Deferred Revenues – Current term		2,559		(89	)		2,470
Deferred Revenues - Long term		31,453		3,961			35,414
Retained earnings		66,172		(3,872	)		62,300

In accordance with the new revenue standard requirements, the disclosure of the impact of adoption on the Company’s condensed consolidated statements of income, cash flows, and balance sheets were as follows:

	March 31, 2018 (Unaudited)
	As Reported		Balances before adoption of ASC 606		Effect of change
Statements of operations
Finance Income		584		1,096		(512	)
Net income		35,686		36,198		(512	)

Cash flows
Net income		35,686		36,198		(512	)
Changes in assets and liabilities:
Deferred revenues		6,981		6,469		512

Balance Sheets
Deferred Revenues - Current		3,010		3,205		(195	)
Deferred Revenues - Long term		41,866		37,287		4,579
Retained earnings		97,986		101,858		(3,872	)

Basis of Presentation:

The accompanying unaudited condensed consolidated interim financial statements have been prepared in accordance with Article 10 of Regulation S-X, “Interim Financial Statements” and the rules and regulations for Form 10-Q of the Securities and Exchange Commission (the “SEC”). Pursuant to those rules and regulations, the Company has condensed or omitted certain information and disclosures in footnotes that it normally includes in its annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).

In management’s opinion, the Company has made all adjustments (consisting only of normal, recurring adjustments, except as otherwise indicated) necessary to fairly present its condensed consolidated financial position, results of operations, and cash flows. The Company’s interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year.

The significant accounting policies applied in the annual consolidated financial statements of the Company as of December 31, 2017, contained in the Company’s Annual Report on Form 10-K filed with the SEC on February 20, 2018, have been applied consistently in these unaudited interim condensed consolidated financial statements, except for the adoption of ASC 606, Revenue - Revenue from Contracts with Customers (see Note 1c).

The Company depends on three contract manufacturers and several limited or single source component suppliers. Reliance on these vendors makes the Company vulnerable to possible capacity constraints and reduced control over component availability, delivery schedules, manufacturing yields, and costs.

These vendors collectively accounted for 60.8% and 51.6% of the Company’s total trade payables as of March 31, 2018 (unaudited) and December 31, 2017, respectively.

The Company has the right to offset its payables to one of its contract manufacturers against vendor non-trade receivables. As of March 31, 2018 (unaudited), a total of $1,658 of these receivables met the criteria for net recognition and were offset against the corresponding accounts payable balances for this contract manufacturer in the accompanying condensed Consolidated Balance Sheets.

Derivative financial instruments:

To protect against the increase in value of forecasted foreign currency cash flows resulting from salary and lease payments of its Israeli facilities denominated in the Israeli currency, the New Israeli Shekels (“NIS”), the Company instituted a foreign currency cash flow hedging program. The Company hedges portions of the anticipated payroll and lease payments denominated in NIS for a period of one to twelve months with hedging contracts.

Accordingly, when the dollar strengthens against the foreign currencies, the decline in present value of future foreign currency expenses is offset by losses in the fair value of the hedging contracts. Conversely, when the dollar weakens, the increase in the present value of future foreign currency cash flows is offset by gains in the fair value of the hedging contracts. These hedging contracts are designated as cash flow hedges, as defined by ASC 815 and are all effective hedges.

In addition to the above-mentioned cash flow hedges transactions, the Company also entered into derivative instrument arrangements to hedge the Company’s exposure to currencies other than the U.S. dollar. These derivative instruments are not designated as cash flow hedges, as defined by ASC 815, and therefore all gains and losses, resulting from fair value remeasurement, were recorded immediately in the statement of operations, as financial income (expenses).

As of March 31, 2018 (unaudited), the Company entered into forward contracts and put and call options to sell Euros for U.S. dollars in the amount of €46.5 million. These hedging contracts do not contain any credit-risk-related contingency features. See Note 4 for information on the fair value of these hedging contracts.

As of March 31, 2018 (unaudited), the Company had no derivative instruments that were designated as cash flow hedges.

The fair value of the Company’s outstanding derivative instruments is as follows:

	Balance as of March 31,			Balance as of December 31,
	2018			2017
	(unaudited)
Derivative assets:
Derivatives not designated as cash flow hedging instruments:
Foreign exchange option contracts	$	111		$	221

Total	$	111		$	221

Derivative liabilities:
Derivatives not designated as cash flow hedging instruments:
Foreign exchange option contracts	$	(566	)	$	(285	)
Foreign exchange forward contracts		(488	)		(116	)

Total	$	(1,054	)	$	(401	)

The Company recorded the fair value of derivative assets and liabilities, net in “accrued expenses and other accounts payable” on the Company’s condensed consolidated balance sheets.

The net increase in unrealized gains (losses) recognized in “accumulated other comprehensive loss” on derivatives, net of tax effect, is as follows:

	Three months ended
	March 31,
	2018		2017
	(unaudited)

Derivatives designated as cash flow hedging instruments:
Foreign exchange forward contracts	$	-	$	909

The net gains reclassified from “accumulated other comprehensive income (loss)” into income (loss), are as follows:

	Three months ended
	March 31,
	2018		2017
	(unaudited)

Derivatives designated as cash flow hedging instruments:
Foreign exchange forward contracts	$	-	$	395

The Company recorded in the financial income, net, a net loss of $1,417 during the three months ended March 31, 2018 (unaudited), related to derivatives not qualified as hedging instruments. No such expenses were recorded in the three months ended March 31, 2017 (unaudited).

Accumulated other comprehensive income:

The following table summarizes the changes in accumulated balances of other comprehensive loss, net of taxes, for the three months ended March 31, 2018 (unaudited):

	Net unrealized losses on available-for-sale marketable securities			Net unrealized losses on foreign currency translation			Total

Beginning balance	$	(433	)	$	(178	)	$	(611	)
Net other comprehensive loss before reclassifications		(510	)		(14	)		(524	)
Net current period other comprehensive loss		(510	)		(14	)		(524	)

Ending balance	$	(943	)	$	(192	)	$	(1,135	)

For the three months period, ended March 31, 2018 (unaudited), there were no amounts reclassified from accumulated other comprehensive income.

The following table summarizes the changes in accumulated balances of other comprehensive loss, net of taxes, for the three months ended March 31, 2017 (unaudited):

	Unrealized gains (losses) on available-for-sale marketable securities			Unrealized gains (losses) on cash flow hedges			Unrealized gains (losses) on foreign currency translation			Total

Beginning balance	$	(136	)	$	19		$	(207	)	$	(324	)
Other comprehensive income (loss) before reclassifications		28			909			(243	)		694
Losses (gains) reclassified from accumulated other comprehensive loss		-			(395	)		-			(395	)
Net current period other comprehensive income (loss)		28			514			(243	)		299

Ending balance	$	(108	)	$	533		$	(450	)	$	(25	)

The following table provides details about reclassifications out of accumulated other comprehensive loss:

Details about Accumulated Other Comprehensive Loss Components	Amount Reclassified from Accumulated Other Comprehensive Loss		Affected Line Item in the Statements of Income
	Three months ended
	March 31, 2017
	(unaudited)

Unrealized gains on cash flow hedges, net		58	Cost of revenues
		207	Research and development
		59	Sales and marketing
		71	General and administrative

		395	Total, before income taxes

		-	Income tax expense

		395	Total, net of income taxes

INVENTORIES

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

INVENTORIES

NOTE 2:-

INVENTORIES

	March 31, 2018		December 31, 2017
	(unaudited)

Raw materials	$	32,345	$	25,887
Finished goods		66,018		57,105

	$	98,363	$	82,992

WARRANTY OBLIGATIONS

3 Months Ended

Mar. 31, 2018

Product Warranties Disclosures [Abstract]

WARRANTY OBLIGATIONS

NOTE 3:-

WARRANTY OBLIGATIONS

Changes in the Company’s product warranty liability for the three months ended March 31, 2018 (unaudited) and 2017 (unaudited) were as follows:

	Three months ended March 31,
	2018			2017
	(unaudited)

Balance, at beginning of period	$	78,811		$	58,375
Additions and adjustments to cost of revenues		13,159			5,498
Usage and current warranty expenses		(3,775	)		(2,748	)

Balance, at end of period		88,195			61,125
Less current portion		(16,605	)		(12,895	)

Long term portion	$	71,590		$	48,230

FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

NOTE 4:-

FAIR VALUE MEASUREMENTS

The Company applies ASC 820 (“Fair Value Measurements and Disclosures”), with respect to fair value measurements of all financial assets and liabilities.

Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability.

A three-tiered fair value hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value:

Level 1-

Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2-

Include other inputs that are directly or indirectly observable in the marketplace.

Level 3-

Unobservable inputs which are supported by little or no market activity.

The fair value hierarchy also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The following table sets forth the Company’s assets that were measured at fair value as of March 31, 2018 (unaudited) by level within the fair value hierarchy:

	Balance as of			Fair value measurements
Description	March 31, 2018			Level 1		Level 2			Level 3
	(unaudited)

Cash equivalents:
Money market mutual funds	$	17,273		$	17,273		-			-

Derivative instruments liability, net	$	(943	)		-	$	(943	)		-

Short-term marketable securities:
Corporate bonds	$	75,241			-	$	75,241			-
Governmental bonds	$	5,988			-	$	5,988			-

Long-term marketable securities:
Corporate bonds	$	80,628			-	$	80,628			-
Governmental bonds	$	7,926			-	$	7,926			-

The following table sets forth the Company’s assets that were measured at fair value as of December 31, 2017 by level within the fair value hierarchy:

	Balance as of			Fair value measurements
Description	December 31, 2017			Level 1		Level 2			Level 3

Cash equivalents:
Money market mutual funds	$	6,163		$	6,163		-			-

Derivative instruments liability, net	$	(180	)		-	$	(180	)		-

Short-term marketable securities:
Corporate bonds	$	68,272			-	$	68,272			-
Governmental bonds	$	8,992			-	$	8,992			-

Long-term marketable securities:
Corporate bonds	$	95,160			-	$	95,160			-
Governmental bonds	$	7,960			-	$	7,960			-

In addition to the assets described above, the Company’s financial instruments also include cash and cash equivalents, restricted and short-term deposits, trade receivables, other accounts receivable, trade payables, accrued expenses and other payables. The fair value of these financial instruments was not materially different from their carrying values on March 31, 2018 due to the short-term maturity of these instruments.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

COMMITMENTS AND CONTINGENT LIABILITIES

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENT LIABILITIES

NOTE 5:-

COMMITMENTS AND CONTINGENT LIABILITIES

Guarantees:

As of March 31, 2018 (unaudited), contingent liabilities exist regarding guarantees in the amounts of $1,443, $57, and $182 related to office rent lease agreements, customs transactions, and credit card limits, respectively.

Contractual purchase obligations:

The Company has contractual obligations to purchase goods and raw materials. These contractual purchase obligations relate to inventories held by contract manufacturers and purchase orders initiated by the contract manufacturers and suppliers, which cannot be canceled without penalty. The Company utilizes third parties to manufacture its products. In addition, it acquires raw materials or other goods and services, including product components, by issuing to suppliers authorizations to purchase based on its projected demand and manufacturing needs.

As of March 31, 2018 (unaudited), the Company had non-cancelable purchase obligations totaling approximately $230,308 out of which the Company already recorded a provision for loss in the amount of $2,078.

As of March 31, 2018, the Company had contractual obligations for capital expenditures totaling approximately $34,208. These commitments reflect purchases of automated assembly lines and other machinery related to the Company’s manufacturing.

Legal claims:

From time to time, the Company may be involved in various claims and legal proceedings. The Company reviews the status of each matter and assesses its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and the amount can be reasonably estimated, the Company accrues a liability for the estimated loss. These accruals are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter.

STOCK CAPITAL

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK CAPITAL

NOTE 6:-

STOCK CAPITAL

Common Stock:

Authorized

Issued and outstanding

Number of shares

March 31, 2018

December 31, 2017

March 31, 2018

December 31, 2017

(unaudited)

Stock of $0.0001 par value:

Common stock

125,000,000

44,897,108

43,812,601

Stock Incentive plans:

The Company’s 2007 Global Incentive Plan (the “2007 Plan”) was adopted by the board of directors on August 30, 2007. On March 31, 2015, once the Company completed its Initial Public Offering (“IPO”), the 2007 Plan was terminated and no further awards will be granted thereunder. All outstanding awards will continue to be governed by their existing terms and 379,358 available options for future grant were transferred to the Company’s 2015 Global Incentive Plan (the “2015 Plan”) and are reserved for future issuances under the 2015 plan.

The 2015 Plan became effective upon the consummation of the IPO. The 2015 Plan provides for the grant of options, RSUs and other share-based awards to directors, employees, officers, and consultants of the Company and its Subsidiaries. As of March 31, 2018 (unaudited), a total of 8,080,717 shares of common stock were reserved for issuance under the 2015 Plan (the “Share Reserve”).

The Share Reserve will automatically increase on January 1st of each year during the term of the 2015 Plan commencing on January 1st of the year following the year in which the 2015 Plan becomes effective in an amount equal to five percent (5%) of the total number of shares of capital stock outstanding on December 31st of the preceding calendar year; provided, however, that our board of directors may determine that there will not be a January 1st increase in the Share Reserve in a given year or that the increase will be less than five percent (5%) of the shares of capital stock outstanding on the preceding December 31st.

The aggregate maximum number of shares of common stock that may be issued on the exercise of incentive stock options is ten million (10,000,000).

As of March 31, 2018 (unaudited), an aggregate of 3,540,859 shares of common stock are still available for future grant under the 2015 Plan.

Options granted to employees and members of the board of directors:

A summary of the activity in the share options granted to employees and members of the board of directors for the three months ended March 31, 2018 (unaudited) and related information follows:

						Weighted
						average
				Weighted		remaining
	Number			average		contractual		Aggregate
	of			exercise		term		intrinsic
	Options			price		in years		Value

Outstanding as of December 31, 2017		3,524,310			7.40		6.35		106,251
Granted		180,983			38.05
Exercised		(901,398	)		5.07
Forfeited or expired		(3,914	)		4.37
Outstanding as of March 31, 2018		2,799,981			10.14		6.64		118,890

Vested and expected to vest as of March 31, 2018		2,722,545			10.02		6.61		115,926

Exercisable as of March 31, 2018		1,692,153			6.19		5.70		78,527

The aggregate intrinsic value represents the total intrinsic value (the difference between the fair value of the Company’s common stock as of the last day of each period and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on the last day of each period. The total intrinsic value of options exercised during the three months ended on March 31, 2018 (unaudited) was $38,557.

The weighted average grant date fair values of options granted to employees and executive directors during the three months ended March 31, 2018 (unaudited) was $20.83.

A summary of the activity in the RSUs granted to employees and members of the board of directors for the three months ended March 31, 2018 (unaudited) is as follows:

	Number of RSUs			Weighted average grant date fair value
Unvested as of December 31, 2017		2,087,992			24.33
Granted		516,561			47.79
Vested		(172,584	)		21.55
Forfeited		(49,383	)		16.89
Unvested as of March 31, 2018		2,382,586			29.65

e. Options and RSUs issued to non-employee consultants:

The Company has granted options and RSUs to purchase common shares to non-employee consultants as of March 31, 2018 (unaudited) as follows:

	Outstanding				Exercisable
	as of				as of
Issuance	March 31,		Exercise		March 31,		Exercisable
Date	2018		price		2018		Through

October 24, 2012		2,000		2.46		2,000	October 24, 2022
January 27, 2014		305		3.51		27	January 27, 2024
May 1, 2014		1,205		3.51		1,205	May 1, 2024
September 17, 2014		4,005		3.96		3,484	September 17, 2024
October 29, 2014		2,279		5.01		167	October 29, 2024
August 19, 2015		8,710		0.00		-
November 8, 2015		1,189		0.00		-
April 18, 2016		1,042		0.00		-
July 11, 2016		1,334		0.00		-
September 21, 2016		2,500		15.34		-	September 21, 2026
September 21, 2016		4,375		0.00		-
March 15, 2017		6,500		0.00		-
March 15, 2017		6,500		13.70		-	March 15, 2027
March 27, 2017		4,000		0.00		-
November 20, 2017		5,626		0.00		-
January 2, 2018		6,570		0.00		-

		58,140				6,883

The Company had accounted for its options and RSUs granted to non-employee consultants under the fair value method of ASC 505-50 (“Equity-Based Payments to Non-Employees”).

In connection with the grant of stock options and RSUs to non‑employee consultants, the Company recorded stock compensation expenses in the three months ended March 31, 2018 (unaudited) and 2017 (unaudited) in the amount of $529 and $ 127, respectively.

Employee Stock Purchase Plan (“ESPP”):

The Company adopted an Employee Stock Purchase Plan (the “ESPP”) effective upon the consummation of the IPO. As of March 31, 2018 (unaudited), a total of 1,739,280 shares were reserved for issuance under this plan. The number of shares of common stock reserved for issuance under the ESPP will increase automatically on January 1st of each year, for ten years, by the lesser of 1% of the total number of shares of the Company’s common stock outstanding on December 31st of the preceding calendar year or 487,643 shares. However, the Company’s board of directors may reduce the amount of the increase in any particular year at their discretion, including a reduction to zero.

The ESPP is implemented through an offering every six months. According to the ESPP, eligible employees may use up to 10% of their salaries to purchase common stock shares up to an aggregate limit of $10 per participant for every six month plan. The price of an ordinary share purchased under the ESPP is equal to 85% of the lower of the fair market value of the ordinary share on the subscription date of each offering period or on the purchase date.

As of March 31, 2018 (unaudited), 268,377 common stock shares had been purchased under the ESPP.

As of March 31, 2018 (unaudited), 1,470,903 common stock shares were available for future issuance under the ESPP.

In accordance with ASC No. 718, the ESPP is compensatory and as such results in recognition of compensation cost.

Stock-based compensation expense for employees and non-employee consultants:

The Company recognized stock-based compensation expenses related to stock options and RSUs granted to employees and non-employee consultants and ESPP in the condensed consolidated statement of income for the three months ended March 31, 2018 (unaudited) and 2017 (unaudited), as follows:

	Three months ended March 31, 2018		Three months ended March 31, 2017

Cost of revenues	$	924	$	493
Research and development		2,382		1,205
Selling and marketing		2,204		1,030
General and administrative		1,339		884

Total stock-based compensation expense	$	6,849	$	3,612

As of March 31, 2018 (unaudited), there was a total unrecognized compensation expense of $78,186 related to non‑vested equity‑based compensation arrangements granted under the Company’s Plans. These expenses are expected to be recognized during the period from April 1, 2018 through May 31, 2022.

BASIC AND DILUTED NET EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

BASIC AND DILUTED NET EARNINGS PER SHARE

NOTE 7:-

BASIC AND DILUTED NET EARNINGS PER SHARE

Basic net earnings per share is computed by dividing the net earnings by the weighted-average number of shares of common stock outstanding during the period.

The total weighted average number of shares related to the outstanding stock options, excluded from the calculation of diluted net earnings per share due to their anti-dilutive effect was 590,115 for the three months ended March 31, 2017 (unaudited).

No shares were excluded from the calculation of diluted net earnings per share due to their anti-dilutive effect for the three months ended March 31, 2018 (unaudited).

The following table presents the computation of basic and diluted net earnings per share for the periods presented (in thousands, except per share data):

	Three months ended March 31,
	2018		2017
	(unaudited)
Numerator:
Net income		35,686		14,175

Denominator:
Shares used in computing net earnings per share of common stock, basic		44,231,679		41,348,225
Effect of stock-based awards		3,441,843		2,489,280
Shares used in computing net earnings per share of common stock, diluted		47,673,522		43,837,505

Basic net income per share	$	0.81	$	0.34
Diluted net income per share	$	0.75	$	0.32

INCOME TAXES

3 Months Ended

Mar. 31, 2018

Income Taxes

INCOME TAXES

NOTE 8:- INCOME TAXES

Taxes on income (tax benefit) are comprised as follows:

	Three months ended March 31,
	2018			2017
	Unaudited

Current period taxes	$	7,001		$	1,069
Deferred tax income, net and others		(1,339	)		(1,830	)

Taxes on income (tax benefit)	$	5,662		$	(761	)

Deferred income taxes:

Deferred income taxes reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes.

Significant components of the Company’s deferred tax liabilities and assets are as follows:

	March 31,		December 31,
	2018		2017
	(Unaudited)

Assets in respect of:

Research and Development carryforward expenses - temporary differences	$	6,289	$	5,380
Stock based compensation		1,640		1,622
Other reserves		1,918		1,338

Net deferred tax assets	$	9,847	$	8,340

Uncertain tax positions:

As of March 31, 2018, the Company recognized a total liability for uncertain tax positions in the amount of $686.

On December 22, 2017, the Tax Cuts and Jobs Act (the "TCJA") was signed into law making significant changes to U.S. income tax law. These changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S. international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings (the “E&P”) as of December 31, 2017.

During the fourth quarter of 2017, the Company calculated its best estimate of the impact of the TCJA in its year end income tax provision in accordance with its understanding of the TCJA and guidance available as of the date of this filing and as a result recorded $19.2 million as an additional income tax expense in the fourth quarter of 2017, the period in which the legislation was enacted.

The provisional amount related to the remeasurement of certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future was $0.5 million. The provisional amount related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings was $18.7 million based on cumulative foreign earnings of $145 million. An additional provisional charge of $0.8 million was recorded in the first quarter of 2018 as a result of IRS guidance issued in January.

Additionally, the TCJA requires certain Global Intangible Low Taxed Income (“GILTI”) earned by controlled foreign corporations (“CFCs”) to be included in the gross income of the CFCs’ U.S. shareholder. GAAP allows the Company to either: (i) treat taxes due on future U.S. inclusions in taxable income related to GILTI as a current-period expense when incurred (the “period cost method”); or (ii) factor such amounts into its measurement of deferred taxes (the “deferred method”). Effective the first quarter of 2018, the Company elected to treat any potential GILTI inclusions as a period cost, as we are not projecting any material impact from GILTI inclusions and any deferred taxes related to any inclusion would be immaterial.

The Company has calculated its best estimate of the impact of the GILTI income tax provision in accordance with its understanding of the TCJA and guidance available as of the date of this filing, and as a result has recorded $1.6 million as an additional income tax expense in the first quarter of 2018, the period in which the legislation was effective.

The final impact of the U.S. tax reform may differ, possibly materially, due to factors such as changes in interpretations and assumptions that the Company has made in its assessment, conclusion of the effects of the GILTI provisions, further refinement of the Company’s calculations, and additional guidance that may be issued by the U.S. government.

As these various factors are finalized, any change will be recorded as an adjustment to the provision for, or benefit from, income taxes in the period in which the amounts are determined, not to exceed 12 months from the date of enactment of the TCJA. The Company has not completed its assessment and the tax charge remains provisional as of March 31, 2018.

CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS

3 Months Ended

Mar. 31, 2018

Risks and Uncertainties [Abstract]

CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS

NOTE 9:-

CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS

For the three month period ended March 31, 2018 (unaudited) and 2017 (unaudited), the Company had one major customer that accounted for 20.4% and 12.7% of its condensed consolidated revenues, respectively.

As of March 31, 2018 (unaudited) and as of December 31, 2017, two customers accounted for approximately 32.3% and 35.2%, respectively, of the Company’s net accounts receivables.

SUBSEQUENT EVENTS

3 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

NOTE 10:-

SUBSEQUENT EVENTS

On May 9, 2018, the Company signed an agreement for the purchase of substantially all of the assets and activities of Gamatronic Electronic Industries Ltd for the aggregate amount of approximately 41 million NIS, including work in process and finished goods inventory. In addition, upon closing, it is expected that the majority of the employees from the business being acquired will become employees of the Company. The Company expects to close the transaction by the end of the second quarter of 2018.

GENERAL (Tables)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Revenue from Contracts with Customers

The effect of the changes made to the consolidated January 1, 2018 balance sheets following the adoption of ASC 606, Revenue - Revenue from Contracts with Customers were as follows:

	Balance as of December 31, 2017		Adjustments due following adoption of ASC 606			Balance as of January 1, 2018
Deferred Revenues – Current term		2,559		(89	)		2,470
Deferred Revenues - Long term		31,453		3,961			35,414
Retained earnings		66,172		(3,872	)		62,300

Schedule of Impact of Adoption of Financial Statements

	March 31, 2018 (Unaudited)
	As Reported		Balances before adoption of ASC 606		Effect of change
Statements of operations
Finance Income		584		1,096		(512	)
Net income		35,686		36,198		(512	)

Cash flows
Net income		35,686		36,198		(512	)
Changes in assets and liabilities:
Deferred revenues		6,981		6,469		512

Balance Sheets
Deferred Revenues - Current		3,010		3,205		(195	)
Deferred Revenues - Long term		41,866		37,287		4,579
Retained earnings		97,986		101,858		(3,872	)

Schedule of Fair Value of Derivative Instruments

The fair value of the Company’s outstanding derivative instruments is as follows:

	Balance as of March 31,			Balance as of December 31,
	2018			2017
	(unaudited)
Derivative assets:
Derivatives not designated as cash flow hedging instruments:
Foreign exchange option contracts	$	111		$	221

Total	$	111		$	221

Derivative liabilities:
Derivatives not designated as cash flow hedging instruments:
Foreign exchange option contracts	$	(566	)	$	(285	)
Foreign exchange forward contracts		(488	)		(116	)

Total	$	(1,054	)	$	(401	)

Schedule of Unrealized Gains (Losses) on Derivatives

The net increase in unrealized gains (losses) recognized in “accumulated other comprehensive loss” on derivatives, net of tax effect, is as follows:

	Three months ended
	March 31,
	2018		2017
	(unaudited)

Derivatives designated as cash flow hedging instruments:
Foreign exchange forward contracts	$	-	$	909

Schedule of Derivative Gains (Losses) Reclassified From OCI Into Income

The net gains reclassified from “accumulated other comprehensive income (loss)” into income (loss), are as follows:

	Three months ended
	March 31,
	2018		2017
	(unaudited)

Derivatives designated as cash flow hedging instruments:
Foreign exchange forward contracts	$	-	$	395

Schedule of Changes in AOCI

The following table summarizes the changes in accumulated balances of other comprehensive loss, net of taxes, for the three months ended March 31, 2018 (unaudited):

	Net unrealized losses on available-for-sale marketable securities			Net unrealized losses on foreign currency translation			Total

Beginning balance	$	(433	)	$	(178	)	$	(611	)
Net other comprehensive loss before reclassifications		(510	)		(14	)		(524	)
Net current period other comprehensive loss		(510	)		(14	)		(524	)

Ending balance	$	(943	)	$	(192	)	$	(1,135	)

The following table summarizes the changes in accumulated balances of other comprehensive loss, net of taxes, for the three months ended March 31, 2017 (unaudited):

	Unrealized gains (losses) on available-for-sale marketable securities			Unrealized gains (losses) on cash flow hedges			Unrealized gains (losses) on foreign currency translation			Total

Beginning balance	$	(136	)	$	19		$	(207	)	$	(324	)
Other comprehensive income (loss) before reclassifications		28			909			(243	)		694
Losses (gains) reclassified from accumulated other comprehensive loss		-			(395	)		-			(395	)
Net current period other comprehensive income (loss)		28			514			(243	)		299

Ending balance	$	(108	)	$	533		$	(450	)	$	(25	)

Schedule of Reclassifications out of AOCI

The following table provides details about reclassifications out of accumulated other comprehensive loss:

Details about Accumulated Other Comprehensive Loss Components	Amount Reclassified from Accumulated Other Comprehensive Loss		Affected Line Item in the Statements of Income
	Three months ended
	March 31, 2017
	(unaudited)

Unrealized gains on cash flow hedges, net		58	Cost of revenues
		207	Research and development
		59	Sales and marketing
		71	General and administrative

		395	Total, before income taxes

		-	Income tax expense

		395	Total, net of income taxes

INVENTORIES (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventories

	March 31, 2018		December 31, 2017
	(unaudited)

Raw materials	$	32,345	$	25,887
Finished goods		66,018		57,105

	$	98,363	$	82,992

WARRANTY OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2018

Product Warranties Disclosures [Abstract]

Schedule of Warranty Obligations

Changes in the Company’s product warranty liability for the three months ended March 31, 2018 (unaudited) and 2017 (unaudited) were as follows:

	Three months ended March 31,
	2018			2017
	(unaudited)

Balance, at beginning of period	$	78,811		$	58,375
Additions and adjustments to cost of revenues		13,159			5,498
Usage and current warranty expenses		(3,775	)		(2,748	)

Balance, at end of period		88,195			61,125
Less current portion		(16,605	)		(12,895	)

Long term portion	$	71,590		$	48,230

FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value

The following table sets forth the Company’s assets that were measured at fair value as of March 31, 2018 (unaudited) by level within the fair value hierarchy:

	Balance as of			Fair value measurements
Description	March 31, 2018			Level 1		Level 2			Level 3
	(unaudited)

Cash equivalents:
Money market mutual funds	$	17,273		$	17,273		-			-

Derivative instruments liability, net	$	(943	)		-	$	(943	)		-

Short-term marketable securities:
Corporate bonds	$	75,241			-	$	75,241			-
Governmental bonds	$	5,988			-	$	5,988			-

Long-term marketable securities:
Corporate bonds	$	80,628			-	$	80,628			-
Governmental bonds	$	7,926			-	$	7,926			-

The following table sets forth the Company’s assets that were measured at fair value as of December 31, 2017 by level within the fair value hierarchy:

	Balance as of			Fair value measurements
Description	December 31, 2017			Level 1		Level 2			Level 3

Cash equivalents:
Money market mutual funds	$	6,163		$	6,163		-			-

Derivative instruments liability, net	$	(180	)		-	$	(180	)		-

Short-term marketable securities:
Corporate bonds	$	68,272			-	$	68,272			-
Governmental bonds	$	8,992			-	$	8,992			-

Long-term marketable securities:
Corporate bonds	$	95,160			-	$	95,160			-
Governmental bonds	$	7,960			-	$	7,960			-

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

STOCK CAPITAL (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Composition of Common Stock Capital

Authorized

Issued and outstanding

Number of shares

March 31, 2018

December 31, 2017

March 31, 2018

December 31, 2017

(unaudited)

Stock of $0.0001 par value:

Common stock

125,000,000

44,897,108

43,812,601

Schedule of Stock Option Activity

A summary of the activity in the share options granted to employees and members of the board of directors for the three months ended March 31, 2018 (unaudited) and related information follows:

						Weighted
						average
				Weighted		remaining
	Number			average		contractual		Aggregate
	of			exercise		term		intrinsic
	Options			price		in years		Value

Outstanding as of December 31, 2017		3,524,310			7.40		6.35		106,251
Granted		180,983			38.05
Exercised		(901,398	)		5.07
Forfeited or expired		(3,914	)		4.37
Outstanding as of March 31, 2018		2,799,981			10.14		6.64		118,890

Vested and expected to vest as of March 31, 2018		2,722,545			10.02		6.61		115,926

Exercisable as of March 31, 2018		1,692,153			6.19		5.70		78,527

Schedule of RSU Activity

A summary of the activity in the RSUs granted to employees and members of the board of directors for the three months ended March 31, 2018 (unaudited) is as follows:

	Number of RSUs			Weighted average grant date fair value
Unvested as of December 31, 2017		2,087,992			24.33
Granted		516,561			47.79
Vested		(172,584	)		21.55
Forfeited		(49,383	)		16.89
Unvested as of March 31, 2018		2,382,586			29.65

Schedule of Options and RSUs Granted to Non-Employee Consultants

The Company has granted options and RSUs to purchase common shares to non-employee consultants as of March 31, 2018 (unaudited) as follows:

	Outstanding				Exercisable
	as of				as of
Issuance	March 31,		Exercise		March 31,		Exercisable
Date	2018		price		2018		Through

October 24, 2012		2,000		2.46		2,000	October 24, 2022
January 27, 2014		305		3.51		27	January 27, 2024
May 1, 2014		1,205		3.51		1,205	May 1, 2024
September 17, 2014		4,005		3.96		3,484	September 17, 2024
October 29, 2014		2,279		5.01		167	October 29, 2024
August 19, 2015		8,710		0.00		-
November 8, 2015		1,189		0.00		-
April 18, 2016		1,042		0.00		-
July 11, 2016		1,334		0.00		-
September 21, 2016		2,500		15.34		-	September 21, 2026
September 21, 2016		4,375		0.00		-
March 15, 2017		6,500		0.00		-
March 15, 2017		6,500		13.70		-	March 15, 2027
March 27, 2017		4,000		0.00		-
November 20, 2017		5,626		0.00		-
January 2, 2018		6,570		0.00		-

		58,140				6,883

Schedule of Recognized Stock-Based Compensation Expense

	Three months ended March 31, 2018		Three months ended March 31, 2017

Cost of revenues	$	924	$	493
Research and development		2,382		1,205
Selling and marketing		2,204		1,030
General and administrative		1,339		884

Total stock-based compensation expense	$	6,849	$	3,612

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08(d))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(27))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644

Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

BASIC AND DILUTED NET EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Earnings (Loss) Per Share

The following table presents the computation of basic and diluted net earnings per share for the periods presented (in thousands, except per share data):

	Three months ended March 31,
	2018		2017
	(unaudited)
Numerator:
Net income		35,686		14,175

Denominator:
Shares used in computing net earnings per share of common stock, basic		44,231,679		41,348,225
Effect of stock-based awards		3,441,843		2,489,280
Shares used in computing net earnings per share of common stock, diluted		47,673,522		43,837,505

Basic net income per share	$	0.81	$	0.34
Diluted net income per share	$	0.75	$	0.32

INCOME TAXES (Tables)

3 Months Ended

Mar. 31, 2018

Income Taxes Tables

Schedule of Taxes on Income

Taxes on income (tax benefit) are comprised as follows:

	Three months ended March 31,
	2018			2017
	Unaudited

Current period taxes	$	7,001		$	1,069
Deferred tax income, net and others		(1,339	)		(1,830	)

Taxes on income (tax benefit)	$	5,662		$	(761	)

Schedule of Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax liabilities and assets are as follows:

	March 31,		December 31,
	2018		2017
	(Unaudited)

Assets in respect of:

Research and Development carryforward expenses - temporary differences	$	6,289	$	5,380
Stock based compensation		1,640		1,622
Other reserves		1,918		1,338

Net deferred tax assets	$	9,847	$	8,340

GENERAL (Narrative) (Details) € in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016	Mar. 31, 2018 EUR (€)
Organization Consolidation and Presentation of Financial Statements [Line Items]
Accounts receivable pledged to offset accounts payable \| $	$ 1,658
Not Designated as Hedging Instrument [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Net gain (loss) on derivatives \| $	$ 1,417
Derivatives not designated as cash flow hedging instruments [Member] \| Foreign exchange forward contracts [Member] \| Put Option [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Derivative asset, notional amount \| €				€ 46,500
Derivatives not designated as cash flow hedging instruments [Member] \| Foreign exchange forward contracts [Member] \| Call Option [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Derivative asset, notional amount \| €				€ 46,500
Accounts Payable [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Concentration risk (as a percent)	60.80%		51.60%

GENERAL (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 02, 2018	Dec. 31, 2017
Deferred Revenues - Current term	$ 3,010		$ 2,559
Deferred Revenues - Long term	41,866		31,453
Retained earnings	$ 97,986		66,172
Adjustments due following adoption of ASC 606 [Member]
Deferred Revenues - Current term			(89)
Deferred Revenues - Long term			3,961
Retained earnings			$ (3,872)
After Adjustment [Member]
Deferred Revenues - Current term		$ 2,470
Deferred Revenues - Long term		35,414
Retained earnings		$ 62,300

GENERAL (Schedule of Impact of Adoption of Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Statements of operations
Finance Income	$ 584	$ 1,410
Net income	35,686	14,175
Cash flows
Net income	35,686	14,175
Changes in assets and liabilities:
Deferred revenues	6,981	$ 2,060
Balance Sheets
Deferred Revenues - Current	3,010
Deferred Revenues - Long term	41,866		$ 31,453
Retained earnings	97,986		$ 66,172
Balances without adoption of ASC 606 [Member]
Statements of operations
Finance Income	1,096
Net income	36,198
Cash flows
Net income	36,198
Changes in assets and liabilities:
Deferred revenues	6,469
Balance Sheets
Deferred Revenues - Current	3,205
Deferred Revenues - Long term	37,287
Retained earnings	101,858
Effect of change [Member]
Statements of operations
Finance Income	(512)
Net income	(512)
Cash flows
Net income	(512)
Changes in assets and liabilities:
Deferred revenues	512
Balance Sheets
Deferred Revenues - Current	(195)
Deferred Revenues - Long term	4,579
Retained earnings	$ (3,872)

GENERAL (Schedule of Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative assets:
Derivative assets	$ 111	$ 221
Derivative liabilities:
Derivetive instrument fair value	(1,054)	(401)
Derivatives not designated as cash flow hedging instruments [Member] \| Foreign exchange option contracts [Member]
Derivative assets:
Derivative assets	111	221
Derivative liabilities:
Derivative liabilities	(566)	(285)
Derivatives not designated as cash flow hedging instruments [Member] \| Foreign exchange forward contracts [Member]
Derivative assets:
Derivative assets
Derivative liabilities:
Derivative liabilities	$ (488)	$ (116)

GENERAL (Schedule of Unrealized Gains (Losses) on Derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivatives not designated as cash flow hedging instruments [Member] \| Foreign exchange forward contracts [Member]
Unrealized gain (loss) on derivatives		$ 909

GENERAL (Schedule of Derivative Gains (Losses) Reclassified From OCI Into Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Foreign exchange forward contracts [Member] \| Derivatives not designated as cash flow hedging instruments [Member]
Net gain (loss) reclassified from accumulated other comprehensive income (loss)		$ 395

GENERAL (Schedule of Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Beginning balance	$ (611)	$ (324)
Net other comprehensive loss before reclassifications	(524)	694
Losses (gains) reclassified from accumulated other comprehensive income (loss)		(395)
Net current period other comprehensive income (loss)	(524)	299
Ending balance	(1,135)	(25)
Net unrealized losses on available-for-sale marketable securities [Member]
Beginning balance	(433)	(136)
Net other comprehensive loss before reclassifications	(510)	28
Losses (gains) reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	(510)	28
Ending balance	(943)	(108)
Unrealized gains (losses) on cash flow hedges [Member]
Beginning balance		19
Net other comprehensive loss before reclassifications		909
Losses (gains) reclassified from accumulated other comprehensive income (loss)		(395)
Net current period other comprehensive income (loss)		514
Ending balance		533
Net unrealized losses on foreign currency translation [Member]
Beginning balance	(178)	(207)
Net other comprehensive loss before reclassifications	(14)	(243)
Losses (gains) reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	(14)	(243)
Ending balance	$ (192)	$ (450)

GENERAL (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financial income	$ 584	$ 1,410
Cost of revenues	130,274	76,378
Research and development, net	17,875	11,458
Sales and marketing	16,205	10,775
General and administrative	4,689	4,439
Total, before income taxes	41,348	13,414
Income tax expense	5,662	(761)
Total, net of income taxes	$ 35,686	14,175
Unrealized gains on cash flow hedges, net [Member] \| Amount Reclassified from Accumulated Other Comprehensive Loss [Member]
Cost of revenues		58
Research and development, net		207
Sales and marketing		59
General and administrative		71
Total, before income taxes		395
Income tax expense
Total, net of income taxes		$ 395

INVENTORIES (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 32,345	$ 25,887
Finished goods	66,018	57,105
Inventories	$ 98,363	$ 82,992

WARRANTY OBLIGATIONS (Details) - USD ($) $ in Thousands	3 Months Ended
WARRANTY OBLIGATIONS (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Changes in the Company's product warranty liability
Balance, at beginning of period	$ 78,811	$ 58,375
Additions and adjustments to cost of revenues	13,159	5,498
Usage and current warranty expenses	(3,775)	(2,748)
Balance, at end of period	88,195	61,125
Less current portion	(16,605)	(12,895)
Long term portion	$ 71,590	$ 48,230

COMMITMENTS AND CONTINGENT LIABILITIES (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Non-cancelable purchase obligations	$ 230,308
Provision for contractual inventory purchase obligations	2,078
Contractual obligations for capital expenditures	34,208
Office Rent Lease Agreements [Member]
Guarantees amount	1,443
Customs Transactions [Member]
Guarantees amount	57
Credit Card Limits [Member]
Guarantees amount	$ 182

STOCK CAPITAL (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 6,849	$ 3,612
Unrecognized compensation expense	$ 78,186
2007 Plan, Transferred to 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options available for future grant under the plan	379,358
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options reserved for issuance under the plan	8,080,717
Number of options available for future grant under the plan	3,540,859
2015 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase percentage	5.00%
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options reserved for issuance under the plan	1,739,280
Number of options available for future grant under the plan	1,470,903
Maximum number of excess shares authorized	487,643
Number of Common stock purchased	268,377
Maximum percentage of salary	10.00%
Maximum amount authorized per person	$ 10
Maximum percentage of common stock	85.00%
ESPP [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase percentage	1.00%
Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options available for future grant under the plan	10,000,000
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised	$ 38,557
Weighted average grant date fair value of options granted	$ 20.83
Stock-based compensation	$ 529	$ 127

STOCK CAPITAL (Schedule of Composition of Common Stock Capital) (Details) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Common stock capital
Par value	$ 0.0001	$ 0.0001
Authorized	125,000,000	125,000,000
Common stock, issued shares	44,897,108	43,812,601
Common stock, outstanding shares	44,897,108	43,812,601

STOCK CAPITAL (Schedule of Stock Option Activity) (Details) - Option [Member] - Employees and Members of Board of Directors [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Number of Options
Outstanding as of December 31, 2017 \| shares	3,524,310
Granted \| shares	180,983
Exercised \| shares	(901,398)
Forfeited or expired \| shares	(3,914)
Outstanding as of March 31, 2018 \| shares	2,799,981
Vested and expected to vest as of March 31, 2018 \| shares	2,722,545
Exercisable as of March 31, 2018 \| shares	1,692,153
Weighted average exercise price
Outstanding as of December 31, 2017 \| $ / shares	$ 7.40
Granted \| $ / shares	38.05
Exercised \| $ / shares	5.07
Forfeited or expired \| $ / shares	4.37
Outstanding as of March 31, 2018 \| $ / shares	10.14
Vested and expected to vest as of March 31, 2018 \| $ / shares	10.02
Exercisable as of March 31, 2018 \| $ / shares	$ 6.19
Weighted average remaining contractual term in years
Outstanding as of December 31, 2017	6 years 4 months 6 days
Ountstanding as of March 31, 2018	6 years 7 months 21 days
Vested and expected to vest as of March 31, 2018	6 years 7 months 10 days
Exercisable as of March 31, 2018	5 years 8 months 12 days
Aggregate intrinsic Value
Outstanding as of December 31, 2017 \| $	$ 106,251
Outstanding as of March 31, 2018 \| $	118,890
Vested and expected to vest as of March 31, 2018 \| $	115,926
Exercisable as of March 31, 2018 \| $	$ 78,527

STOCK CAPITAL (Schedule of RSU Activity) (Details) - Restricted Stock Units (RSUs) [Member] - Employees and Members of Board of Directors [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Number of RSUs
Unvested as of December 31, 2017 \| shares	2,087,992
Granted \| shares	516,561
Vested \| shares	(172,584)
Forfeited \| shares	(49,383)
Unvested as of March 31, 2018 \| shares	2,382,586
Weighted average grant date fair value
Unvested as of December 31, 2017 \| $ / shares	$ 24.33
Granted \| $ / shares	47.79
Vested \| $ / shares	21.55
Forfeited \| $ / shares	16.89
Unvested as of March 31, 2018 \| $ / shares	$ 29.65

STOCK CAPITAL (Schedule of Options and RSUs Granted to Non-Employee Consultants) (Details) - Options And RSUs [Member] - Nonemployee Consultants [Member]	Mar. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	58,140
Exercisable at the end of the period	6,883
October 24, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	2,000
Exercise price \| $ / shares	$ 2.46
Exercisable at the end of the period	2,000
January 27, 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	305
Exercise price \| $ / shares	$ 3.51
Exercisable at the end of the period	27
May 1, 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	1,205
Exercise price \| $ / shares	$ 3.51
Exercisable at the end of the period	1,205
September 17, 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	4,005
Exercise price \| $ / shares	$ 3.96
Exercisable at the end of the period	3,484
October 29, 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	2,279
Exercise price \| $ / shares	$ 5.01
Exercisable at the end of the period	167
August 19, 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	8,710
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
November 8, 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	1,189
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
April 18, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	1,042
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
July 11, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	1,334
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
September 21, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	2,500
Exercise price \| $ / shares	$ 15.34
Exercisable at the end of the period
September 21, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	4,375
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
March 15, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	6,500
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
March 15, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	6,500
Exercise price \| $ / shares	$ 13.70
Exercisable at the end of the period
March 27, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	4,000
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
November 20, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	5,626
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period
January 2, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	6,570
Exercise price \| $ / shares	$ 0.00
Exercisable at the end of the period

STOCK CAPITAL (Schedule of Recognized Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 6,849	$ 3,612
Cost of revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	924	493
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	2,382	1,205
Selling and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	2,204	1,030
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 1,339	$ 884

BASIC AND DILUTED NET EARNINGS PER SHARE (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017 shares
Earnings Per Share [Abstract]
Anti-dilutive securities	590,115

BASIC AND DILUTED NET EARNINGS PER SHARE (Schedule of Computation of Basic and Diluted Net Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income	$ 35,686	$ 14,175
Denominator:
Shares used in computing net earnings per share of common stock, basic	44,231,679	41,348,225
Effect of stock-based awards	3,441,843	2,489,280
Shares used in computing net earnings per share of common stock, diluted	47,673,522	43,837,505
Basic net income per share	$ 0.81	$ 0.34
Diluted net income per share	$ 0.75	$ 0.32

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Additional income tax expense	$ 1,600	$ 19,200
Additional provisional charge	800
Expected to reverse amount in future for income tax		500
One-time transition tax for foreign earnings		18,700
One-time transition tax for cumulative foreign earnings		$ 145,000
Unrecognized tax benefits	$ 686

INCOME TAXES (Schedule of Taxes on Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Taxes Schedule Of Taxes On Income Details
Current period taxes	$ 7,001	$ 1,069
Deferred tax income, net and others	(1,339)	(1,830)
Taxes on income (tax benefit)	$ 5,662	$ (761)

INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets in respect of:
Research and Development carryforward expenses - temporary differences	$ 6,289	$ 5,380
Stock based compensation	1,640	1,622
Other reserves	1,918	1,338
Net deferred tax assets	$ 9,847	$ 8,340

CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Details)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues [Member] \| Two Major Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	20.40%	12.70%
Revenues [Member] \| One Major Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	20.40%	12.74%
Accounts Receivable [Member] \| Two Major Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	32.30%	35.20%

FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	$ 17,273	$ 6,163
Derivative instruments liability, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	(943)	(180)
Short-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	75,241	68,272
Short-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	5,988	8,992
Long-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	80,628	95,160
Long-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	7,926	7,960
Level 1 [Member] \| Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	17,273	6,163
Level 1 [Member] \| Derivative instruments liability, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities
Level 1 [Member] \| Derivative instruments liability, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities
Level 1 [Member] \| Short-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 1 [Member] \| Short-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 1 [Member] \| Long-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 1 [Member] \| Long-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 2 [Member] \| Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 2 [Member] \| Derivative instruments liability, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities		(180)
Level 2 [Member] \| Derivative instruments liability, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	(943)
Level 2 [Member] \| Short-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	75,241	68,272
Level 2 [Member] \| Short-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	5,988	8,992
Level 2 [Member] \| Long-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	80,628	95,160
Level 2 [Member] \| Long-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	7,926	7,960
Level 3 [Member] \| Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 3 [Member] \| Derivative instruments liability, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities
Level 3 [Member] \| Derivative instruments liability, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities
Level 3 [Member] \| Short-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 3 [Member] \| Short-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 3 [Member] \| Long-term marketable securities Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets
Level 3 [Member] \| Long-term marketable securities Governmental bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets