Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Stockholders' Equity Note [Abstract]

Share-based Compensation, Stock Options, Activity

A summary of employees’ stock options activities during the three months ended March 31, 2021 is as follows:

	Three Months Ended March 31, 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	(65,004)	$	4.941
Forfeited and expired	(3,000)	$	2.077
Options outstanding as of March 31, 2021	954,759	$	7.008	$	42,327	3.453
Options exercisable as of March 31, 2021	929,880	$	7.043	$	41,191	3.308

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

The options outstanding as of March 31, 2021 (unaudited) have been separated into ranges of exercise price as follows:

Range of exercise price				Options outstanding as of March 31, 2021	Weighted average remaining contractual life (years)	Weighted average exercise price of options outstanding		Options exercisable as of March 31, 2021	Weighted average remaining contractual life (years)	Weighted average exercise price of options exercisable
		$2.933		22,068	0.912	$	2.933	22,068	0.912	$	2.933
$	4.157	—	5.682	261,174	3.801	$	4.977	236,295	3.268	$	4.889
$	6.503	—	8.077	504,651	3.287	$	7.147	504,651	3.287	$	7.147
		$9.960		139,644	3.896	$	9.960	139,644	3.896	$	9.960
		$13.287		27,222	2.975	$	13.287	27,222	2.975	$	13.287
				954,759	3.453	$	7.008	929,880	3.308	$	7.043

Schedule of Stockholders' Equity Note, Warrants or Rights

The Company’s outstanding options granted to consultants for services as of March 31, 2021 (unaudited) were as follows:

	Number of options outstanding and exercisable as of March 31, 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 three months ended March 31, 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	2,201,865	$	67.56
Vested	(2,552,277)	$	19.77
Forfeited	(111,501)	$	24.83
Unvested balance – March 31, 2021	7,927,050	$	36.39

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 (in thousands):

	Three Months Ended March 31,
	2021		2020
	(unaudited)
Cost of revenues	$	1,589	$	785
Research and development	7,158		4,081
Sales and marketing	7,742		4,729
General and administrative	4,890		3,288
Total	$	21,379	$	12,883