Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Stockholders' Equity Note [Abstract]

Share-based Compensation, Stock Options, Activity

A summary of employees’ stock options activities during the three months ended March 31, 2020 is as follows:

	Three Months Ended March 31, 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	(40,207)	$	20.011
Forfeited and expired	(500)	$	1.576
Options outstanding and exercisable as of March 31, 2020	413,641	$	20.711	$	17,770	4.107

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

The options outstanding as of March 31, 2020 (unaudited) have been separated into ranges of exercise price as follows:

Range of exercise price				Options outstanding and exercisable as of March 31, 2020	Weighted average remaining contractual life (years)	Weighted average exercise price of options outstanding and exercisable
$	6.230	—	8.800	10,856	1.816	$	8.216
$	12.470	—	16.870	119,738	3.696	$	14.101
$	19.510	—	21.660	155,523	4.348	$	21.170
$	22.010	—	24.230	57,882	4.055	$	22.281
		$29.880		53,088	4.896	$	29.880
		$39.860		16,554	3.975	$	39.860
				413,641	4.107	$	20.711

Schedule of Stockholders' Equity Note, Warrants or Rights

The Company’s outstanding options granted to consultants for services as of March 31, 2020 (unaudited) were as follows:

	Options outstanding and exercisable as of March 31, 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	3,200	$	39.860	March 2024
May 2014	3,700	$	22.010	May 2024
November 2014	4,128	$	21.660	November 2024
May 2015	1,057	$	19.510	May 2025
February 2016	1,950	$	16.870	February 2026
	19,535

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, 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	1,011,465	$	91.98
Vested	(780,818)	$	42.88
Forfeited	(60,263)	$	56.50
Unvested balance – March 31, 2020	2,729,467	$	67.06

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 March 31,
	2020		2019
	(unaudited) (in thousands)
Cost of revenues	$	785	$	558
Research and development	4,081		2,678
Sales and marketing	4,729		3,443
General and administrative	3,288		2,282
Total	$	12,883	$	8,961