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Stock-Based Compensation - Option activity (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 02, 2013	Mar. 31, 2021	Mar. 31, 2020
Employee stock options
Number of Shares subject to outstanding options
Balance at the beginning of the period (in shares)				7,751,789
Options granted (in shares)				1,321,917	1,137,420
Options forfeited (in shares)				(64,824)
Options exercised (in shares)				(230,701)
Balance at the end of the period (in shares)	8,778,181	7,751,789		8,778,181
Exercisable options (in shares)	4,963,607			4,963,607
Weighted Average Exercise Price (Per Share)
Balance at the beginning of the period (in dollars per share)				$ 26.23
Options granted (in dollars per share)				43.24
Options forfeited (in dollars per share)				33.00
Options exercised (in dollars per share)				23.14
Balance at the end of the period (in dollars per share)	$ 28.82	$ 26.23		28.82
Exercisable (in dollars per share)	$ 22.73			$ 22.73
Weighted-average remaining contractual life	7 years 3 months	7 years
Weighted-average remaining contractual life of awards exercisable	5 years 11 months 12 days
Aggregate intrinsic value of options outstanding	$ 125,395	$ 134,941		$ 125,395
Aggregate intrinsic value of options exercisable	$ 100,938			$ 100,938
Closing price of common stock (in dollars per share)	$ 43.06			$ 43.06
Weighted average fair value of options granted (in dollars per share)				$ 22.83	$ 16.64
The 2010 Plan
Number of Shares subject to outstanding options
Options granted (in shares)			0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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