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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

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,
															2021						2020						2019
Cost of revenues															$	1,621					$	950					$	426
Research and development															37,131						31,588						22,229
Sales and marketing															13,887						9,606						7,380
General and administrative															56,207						41,911						34,874
Total share-based compensation expense															$	108,846					$	84,055					$	64,909

Summary of Assumptions Used to Determine Fair Value of ESPP

The following table summarizes the key assumptions used to determine the fair value of the awards:

Expected term (years)			3.00
Expected volatility			49.04		%
Expected dividends			—		%
Risk-free interest rate			0.27		%

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

									Years Ended December 31,
															2021						2020						2019
Expected term (years)															0.50						0.50						0.50
Expected volatility															47.02%-99.96%						52.06%-68.09%						40.51%-41.81%
Dividend yield															—		%				—		%				—		%
Risk-free interest rate															0.04%-0.07%						0.12%-0.15%						1.59%-2.43%
Weighted-average grant-date fair value per share															$	14.70					$	20.52					$	9.88

Summary of Restricted Stock Unit Activity

RSUs and PSUs Activity

			RSUs and PSUs Outstanding
			Number of RSUs and PSUs Outstanding						Weighted Average Grant Date Fair Value
Balance at December 31, 2020			4,816,000						$	37.82
Granted			6,758,593						47.95
Released			(2,762,251)						34.77
Forfeited			(640,880)						48.97
Balance at December 31, 2021			8,171,462						$	46.36

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, 2020									627,317						$	7.86					3.48						$	51,733,285
Released									(245,561)						8.78
Balance at December 31, 2021									381,756						$	7.28					2.80						$	8,942,541

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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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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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