Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Stockholders' Equity Note [Abstract]

Share-based Compensation, Stock Options, Activity

A summary of employees’ stock options activities during the six months ended June 30, 2020 is as follows:

	Six Months Ended June 30, 2020 (unaudited)
	Number	Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding as of January 1, 2020	454,348	$	20.628	$	25,935	4.343
Granted	—	$	—
Exercised	(64,005)	$	19.991
Forfeited and expired	(500)	$	1.576
Options outstanding and exercisable as of June 30, 2020	389,843	$	20.757	$	26,401	3.925

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

The options outstanding as of June 30, 2020 (unaudited) have been separated into ranges of exercise price as follows:

Range of exercise price				Options outstanding and exercisable as of June 30, 2020	Weighted average remaining contractual life (years)	Weighted average exercise price of options outstanding and exercisable
$	6.230	—	8.800	10,856	1.566	$	8.216

$	12.470	—	16.870	109,838	3.621	$	14.232
$	19.510	—	21.660	147,900	4.127	$	21.158
$	22.010	—	24.230	54,367	3.807	$	22.277
		$29.880		53,088	4.647	$	29.880
		$39.860		13,794	3.726	$	39.860
				389,843	3.925	$	20.757

Schedule of Stockholders' Equity Note, Warrants or Rights

The Company’s outstanding options granted to consultants for services as of June 30, 2020 (unaudited) were as follows:

	Options outstanding and exercisable as of June 30, 2020	Exercise price per share		Exercisable through
	(number)
February 2013	1,500	$	12.470	February 2023
August 2013	4,000	$	21.140	August 2023
March 2014	2,700	$	39.860	March 2024
May 2014	3,700	$	22.010	May 2024
November 2014	4,038	$	21.660	November 2024
May 2015	1,057	$	19.510	May 2025
February 2016	1,950	$	16.870	February 2026
	18,945

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, 2020 (unaudited) is as follows:

	Number of shares underlying outstanding restricted stock units	Weighted- average grant date fair value
Unvested balance - January 1, 2020	2,559,083	$	49.58
Granted	1,296,911	$	84.52
Vested	(833,037)	$	43.77
Forfeited	(131,362)	$	59.87
Unvested balance – June 30, 2020	2,891,595	$	66.46

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,
	2020		2019		2020		2019
	(unaudited) (in thousands)				(unaudited) (in thousands)
Cost of revenues	$	1,354	$	772	$	2,139	$	1,330
Research and development	5,686		3,520		9,767		6,198
Sales and marketing	6,860		3,640		11,589		7,083
General and administrative	3,723		6,864		7,011		9,146
Total	$	17,623	$	14,796	$	30,506	$	23,757