Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2021

Stockholders' Equity Note [Abstract]

Share-based Compensation, Stock Options, Activity

A summary of employees’ stock options activities during the six months ended June 30, 2021 is as follows:

 

	Six Months Ended June 30, 2021 (unaudited)
	Number	Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding as of January 1, 2021	1,022,763	$	6.862	$	47,417	3.452
Granted	—	$	—
Exercised	(70,371)	$	5.086
Forfeited and expired	(3,000)	$	2.077
Options outstanding as of June 30, 2021	949,392	$	7.009	$	48,050	3.208
Options exercisable as of June 30, 2021	928,569	$	7.039	$	46,968	3.087

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

The options outstanding as of June 30, 2021 (unaudited) have been separated into ranges of exercise price as follows:

Range of exercise price				Options outstanding as of June 30, 2021	Weighted average remaining contractual life (years)	Weighted average exercise price of options outstanding		Options exercisable as of June 30, 2021	Weighted average remaining contractual life (years)	Weighted average exercise price of options exercisable
		$2.933		22,068	0.663	$	2.933	22,068	0.663	$	2.933
$	4.157	—	5.682	260,874	3.566	$	4.978	240,051	3.128	$	4.905
$	6.503	—	8.077	499,584	3.038	$	7.149	499,584	3.038	$	7.149
		$9.960		139,644	3.647	$	9.960	139,644	3.647	$	9.960
		$13.287		27,222	2.726	$	13.287	27,222	2.726	$	13.287
				949,392	3.208	$	7.009	928,569	3.087	$	7.039

Schedule of Stockholders' Equity Note, Warrants or Rights

The Company’s outstanding options granted to consultants for services as of June 30, 2021 (unaudited) were as follows:

 

	Number of options outstanding and exercisable as of June 30, 2021	Exercise price per share		Exercisable through
August 2013	7,500	$	7.047	August 2023
March 2014	4,950	$	13.287	March 2024
May 2014	6,000	$	7.337	May 2024
November 2014	10,335	$	7.220	November 2024
February 2016	3,000	$	5.623	February 2026
	31,785

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, 2021 (unaudited) is as follows:

 

	Number of shares underlying outstanding restricted stock units	Weighted- average grant date fair value
Unvested balance - January 1, 2021	8,388,963	$	23.00
Granted	2,435,253	$	65.75
Vested	(3,312,762)	$	19.85
Forfeited	(355,433)	$	32.98
Unvested balance – June 30, 2021	7,156,021	$	38.51

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):

 

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(unaudited)				(unaudited)
Cost of revenues	$	1,856	$	1,354	$	3,445	$	2,139
Research and development	8,920		5,686		16,078		9,767
Sales and marketing	9,492		6,860		17,234		11,589
General and administrative	5,600		3,723		10,490		7,011
Total	$	25,868	$	17,623	$	47,247	$	30,506