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Stockholders' Equity - ESPP (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contributions withheld for taxes	$ 3,500	$ 2,000	$ 6,000	$ 6,100
Stock-based compensation expense	36,636	12,142	$ 100,900	$ 34,752
Stock repurchased during period (in shares)			0.2	0.2
Shares issuable pursuant to the ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee contribution as a percentage of salary			15.00%
Offering period duration			6 months
Purchase price of common stock, percent			85.00%
Stock-based compensation expense	$ 600	$ 400	$ 2,700	$ 2,300

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