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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]



	Authorized		Issued and outstanding
	Number of shares
	December 31,		December 31,
	2018	2017	2018	2017
Stock of $0.001 par value:
Common stock	200,000,000	200,000,000	29,576,880	28,146,162

Share-based Compensation, Stock Options, Activity

A summary of employees’ stock options activities during the year ended December 31, 2018 is as follows:



	Year ended
	December 31, 2018
	Number		Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding at the beginning of the year	1,456,285		$	16.172	$	47,152	4.906
Granted	—		$	—
Exercised	(744,636	)	$	14.469
Forfeited	(1,981	)	$	32.473
Options outstanding at the end of the period	709,668		$	17.941	$	24,810	4.513
Options exercisable at the end of the period	687,508		$	17.856	$	24,093	4.439

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The options outstanding as of December 31, 2018 have been separated into ranges of exercise price as follows:



Range of exercise price				Options outstanding as of December 31, 2018	Weighted average remaining contractual life (years)	Weighted average exercise price		Options exercisable as of December 31, 2018	Weighted average remaining contractual life (years)	Weighted average exercise price of options exercisable
$	1.256	—	1.576	130,479	0.663	$	1.282	130,479	0.663	$	1.282
$	6.230	—	8.800	12,356	3.007	$	8.039	12,356	3.007	$	8.039
$	12.470	—	16.870	147,125	5.014	$	14.030	132,541	4.781	$	13.637
$	19.510	—	21.660	220,211	5.599	$	21.174	218,573	5.594	$	21.185
$	22.010	—	24.230	85,870	5.284	$	22.364	85,870	5.284	$	22.364
		$29.880		66,349	6.145	$	29.880	60,411	6.145	$	29.880
		$39.860		47,278	5.225	$	39.860	47,278	5.225	$	39.860
				709,668	4.513	$	17.941	687,508	4.439	$	17.856

Schedule of Stockholders' Equity Note, Warrants or Rights

The Company’s outstanding options granted to consultants for services as of December 31, 2018 were as follows:



Issuance date	Options for shares of common stock	Exercise price per share		Options exercisable	Exercisable through
	(number)			(number)
February 2013	1,500	$	12.470	1,500	February 2023
August 2013	4,000	$	21.140	4,000	August 2023
March 2014	5,550	$	39.860	5,550	March 2024
May 2014	3,700	$	22.010	3,700	May 2024
November 2014	5,468	$	21.660	5,468	November 2024
May 2015	1,137	$	19.510	929	May 2025
February 2016	2,138	$	16.870	1,408	February 2026
	23,493			22,555

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

The following provides a summary of the restricted stock unit activity for the Company for the year ended December 31, 2018:



	Number of Shares Underlying Outstanding Restricted Stock Units		Weighted- Average Grant Date Fair Value
Outstanding as of January 1, 2018	2,018,121		$	27.32
Granted	1,255,824		$	53.79
Vested	(671,768	)	$	28.54
Forfeited	(162,150	)	$	36.89
Unvested as of December 31, 2018	2,440,027		$	40.00

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The Company recognized non-cash stock-based compensation expense in the consolidated statements of operations as follows (in thousands):



	Year ended
	December 31,
	2018		2017		2016
Cost of revenues	$	1,757	$	1,078	$	699
Research and development	9,645		5,209		3,052
Sales and marketing	16,081		8,542		6,104
General and administrative	7,478		5,006		3,083
Total	$	34,961	$	19,835	$	12,938

- 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

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+ Details

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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