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Fair Value Measurements - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash equivalents
Cash and cash equivalents	$ 92,250	$ 43,759
Short-term marketable securities
Fair Value	33,922	$ 49,620
Total	53,827
Unrealized Gain	21
Unrealized Loss	(2)
Fair Value	53,846
Money market funds
Cash equivalents
Cash and cash equivalents	5,602
Unrealized Gain	0
Unrealized Loss	0
Fair Value	5,602
Commercial paper
Cash equivalents
Cash and cash equivalents	14,323
Unrealized Gain	0
Unrealized Loss	(1)
Fair Value	14,322
Agency bonds
Short-term marketable securities
Amortized Cost	26,805
Unrealized Gain	21
Unrealized Loss	0
Fair Value	26,826
Commercial paper
Short-term marketable securities
Amortized Cost	7,097
Unrealized Gain	0
Unrealized Loss	(1)
Fair Value	$ 7,096

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