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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation Expense for Employees and Non-Employees

Total share-based compensation expense recorded for employees and non-employees, is as follows (in thousands):

	Years Ended December 31,
	2019				2018				2017
Cost of revenues	$	426			$	420			$	316
Research and development	22,229				17,055				14,333
Sales and marketing	7,380				6,703				5,007
General and administrative	34,874				27,852				18,703
Total share-based compensation expense	$	64,909			$	52,030			$	38,359

Summary of Assumptions Used to Determine Fair Value of ESPP

The following table summarizes the key assumptions used to determine the fair value of rights granted under the 2013 ESPP:

	Years Ended December 31,
	2019				2018				2017
Expected term (years)	0.50				0.50				0.50
Expected volatility	40.51%-41.81%				42.07%-44.97%				38.15%-45.57%
Dividend yield	—		%		—		%		—		%
Risk-free interest rate	1.59%-2.43%				2.09%-2.50%				1.04%-1.42%
Weighted-average grant-date fair value per share	$	9.88			$	7.14			$	3.55

Summary of Stock Option Activity

Stock Option Activity

	Options Outstanding
	Number of Options Outstanding			Weighted- Average Exercise Price per Share				Weighted-Average Remaining Contractual Term in Years		Aggregate Intrinsic Value
Balance at December 31, 2018	4,776,481			$	9.40			4.25		$	90,848,450
Exercised	(3,165,096	)		9.79
Balance at December 31, 2019	1,611,385			$	8.64			3.60		$	47,171,160

Summary of Restricted Stock Unit Activity

RSU and PSU Activity

	RSUs and PSUs Outstanding
	Number of RSUs and PSUs Outstanding			Weighted  Average Grant Date  Fair Value
Balance at December 31, 2018	10,804,808			$	11.87
Granted	2,910,400			37.56
Released	(5,628,938	)		10.15
Canceled	(1,176,740	)		12.20
Balance at December 31, 2019	6,909,530			$	24.04

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