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Cash Equivalents and Investments - Schedule of Fair Value of Securities, not Including Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 306,401	$ 141,934
Gross Unrealized Gains	18	83
Gross Unrealized Losses	(7)	(1)
Estimated Fair Value	306,412	142,016
Classified as:
Cash equivalents	59,823	13,897
Short-term investments	246,589	120,089
Long-term investments	0	8,030
Total cash equivalents and available-for-sale investments	306,412	142,016
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	190,663	77,329
Gross Unrealized Gains	16	72
Gross Unrealized Losses	(2)	(1)
Estimated Fair Value	190,677	77,400
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,426	14,955
Gross Unrealized Gains	2	11
Gross Unrealized Losses	(5)	0
Estimated Fair Value	26,423	14,966
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,489	35,753
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	29,489	35,753
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,823	13,897
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 59,823	$ 13,897

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