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Fair Value Measurements - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	[1]
Cash equivalents
Cash and cash equivalents	$ 157,530	$ 43,759
Short-term marketable securities
Fair Value	70,212	$ 49,620
Total	189,980
Unrealized Gain	4
Unrealized Loss	(7)
Fair Value	189,977
Money market funds
Cash equivalents
Cash and cash equivalents	19,371
Unrealized Gain	0
Unrealized Loss	0
Fair Value	19,371
Commercial paper
Cash equivalents
Cash and cash equivalents	100,398
Unrealized Gain	0
Unrealized Loss	(4)
Fair Value	100,394
Agency bonds
Short-term marketable securities
Amortized Cost	1,276
Unrealized Gain	0
Unrealized Loss	0
Fair Value	1,276
Commercial paper
Short-term marketable securities
Amortized Cost	66,413
Unrealized Gain	4
Unrealized Loss	(3)
Fair Value	66,414
Corporate bond
Short-term marketable securities
Amortized Cost	2,522
Unrealized Gain	0
Unrealized Loss	0
Fair Value	$ 2,522
[1] See Note 1 – Summary of Business and Significant Accounting Policies

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