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Stockholders' Equity - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Number of shares outstanding	15,264,607	13,462,964	11,845,376
Number of shares granted	4,933,480	4,052,011	4,300,621
Number of shares exercised	(1,983,221)	(1,529,509)	(1,350,605)
Number of shares cancelled	(1,550,226)	(720,859)	(1,332,428)
Number of shares outstanding	16,664,640	15,264,607	13,462,964
Number of shares outstanding, weighted average exercise price	$ 18.33	$ 15.03	$ 14.44
Number of shares granted, weighted average exercise price	24.21	26.83	16.17
Number of shares exercised, weighted average exercise price	11.18	11.97	8.49
Number of shares cancelled, weighted average exercise price	23.26	17.98	20.06
Number of shares outstanding, weighted average exercise price	$ 20.47	$ 18.33	$ 15.03

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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