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Stockholders' Equity - Summary of Stock Option Plan Activity (Including Restricted Stock Units) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	18,912,529
Stock Option and RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	16,664,640	15,264,607	13,462,964
Number of shares granted	4,659,942	4,933,480	4,052,011
Number of shares exercised	(544,441)	(1,983,221)	(1,529,509)
Number of shares cancelled	(1,264,871)	(1,550,226)	(720,859)
Number of shares outstanding	19,515,270	16,664,640	15,264,607
Number of shares outstanding, weighted average exercise price	$ 20.47	$ 18.33	$ 15.03
Number of shares granted, weighted average exercise price	13.95	24.21	26.83
Number of shares exercised, weighted average exercise price	12.41	11.18	11.97
Number of shares cancelled, weighted average exercise price	22.84	23.26	17.98
Number of shares outstanding, weighted average exercise price	$ 18.98	$ 20.47	$ 18.33

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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