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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

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,
															2020						2019						2018
Cost of revenues															$	950					$	426					$	420
Research and development															31,588						22,229						17,055
Sales and marketing															9,606						7,380						6,703
General and administrative															41,911						34,874						27,852
Total share-based compensation expense															$	84,055					$	64,909					$	52,030

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,
															2020						2019						2018
Expected term (years)															0.50						0.50						0.50
Expected volatility															52.06%-68.09%						40.51%-41.81%						42.07%-44.97%
Dividend yield															—		%				—		%				—		%
Risk-free interest rate															0.12%-0.15%						1.59%-2.43%						2.09%-2.50%
Weighted-average grant-date fair value per share															$	20.52					$	9.88					$	7.14

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, 2019									1,611,385						$	8.64					3.60						$	47,171,160
Exercised									(984,068)						9.13
Balance at December 31, 2020									627,317						$	7.86					3.48						$	51,733,285

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, 2019			6,909,530						$	24.04
Granted			2,593,745						45.37
Released			(4,098,742)						20.22
Canceled			(588,533)						31.84
Balance at December 31, 2020			4,816,000						$	37.82

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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