Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders' Equity Note [Abstract]

Share-based Compensation, Stock Options, Activity

A summary of employees’ stock options activities during the six months ended June 30, 2019 is as follows:

	Six Months Ended June 30, 2019 (unaudited)
	Number		Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding as of January 1, 2019	709,668		$	17.941	$	24,810	4.513
Granted	—		$	—
Exercised	(172,923	)	$	7.923
Forfeited	—		$	—
Options outstanding as of June 30, 2019	536,745		$	21.168	$	21,884	4.797
Options exercisable as of June 30, 2019	528,411		$	21.236	$	21,509	4.768

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

The options outstanding as of June 30, 2019 (unaudited) have been separated into ranges of exercise price as follows:

Range of exercise price				Options outstanding as of June 30, 2019	Weighted average remaining contractual life (years)	Weighted average exercise price		Options exercisable as of June 30, 2019	Weighted average remaining contractual life (years)	Weighted average exercise price of options exercisable
		$1.576		8,470	0.662	$	1.576	8,470	0.662	$	1.576
$	6.230	—	8.800	11,856	2.496	$	8.084	11,856	2.496	$	8.084
$	12.470	—	16.870	141,925	4.540	$	14.082	133,591	4.409	$	13.866
$	19.510	—	21.660	191,452	5.059	$	21.168	191,452	5.059	$	21.168
$	22.010	—	24.230	81,920	4.784	$	22.381	81,920	4.784	$	22.381
		$29.880		61,705	5.649	$	29.880	61,705	5.649	$	29.880
		$39.860		39,417	4.729	$	39.860	39,417	4.729	$	39.860
				536,745	4.797	$	21.168	528,411	4.768	$	21.236

Schedule of Stockholders' Equity Note, Warrants or Rights

The Company’s outstanding options granted to consultants for services as of June 30, 2019 (unaudited) were as follows:

	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	1,137	May 2025
February 2016	2,138	$	16.870	1,720	February 2026
	23,493			23,075

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

A summary of restricted stock units and performance stock units for employees, consultants and non-employee directors of the Company for the six months ended June 30, 2019 (unaudited) is as follows:

	Number of shares underlying outstanding restricted stock units		Weighted- average grant date fair value
Unvested balance - January 1, 2019	2,440,027		$	40.00
Granted	1,220,534		$	57.24
Vested	(688,993	)	$	35.73
Forfeited	(219,314	)	$	44.53
Unvested balance – June 30, 2019	2,752,254		$	48.39

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:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(unaudited) (in thousands)				(unaudited) (in thousands)
Cost of revenues	$	772	$	468	$	1,330	$	830
Research and development	3,520		2,978		6,198		5,083
Sales and marketing	3,640		3,648		7,083		6,749
General and administrative	6,864		1,754		9,146		3,113
Total	$	14,796	$	8,848	$	23,757	$	15,775