Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial Assets
Financial assets, fair value	$ 86,874	$ 133,775
Corporate bonds
Financial Assets
Financial assets, fair value	12,574	3,001
Commercial paper
Financial Assets
Financial assets, fair value	65,412
Money market funds
Financial Assets
Financial assets, fair value	8,888	6,700
U.S. treasury securities
Financial Assets
Financial assets, fair value		57,181
U.S. government agency securities
Financial Assets
Financial assets, fair value		66,893
Level 1
Financial Assets
Financial assets, fair value	8,888	6,700
Level 1 | Money market funds
Financial Assets
Financial assets, fair value	8,888	6,700
Level 2
Financial Assets
Financial assets, fair value	77,986	127,075
Level 2 | Corporate bonds
Financial Assets
Financial assets, fair value	12,574	3,001
Level 2 | Commercial paper
Financial Assets
Financial assets, fair value	$ 65,412
Level 2 | U.S. treasury securities
Financial Assets
Financial assets, fair value		57,181
Level 2 | U.S. government agency securities
Financial Assets
Financial assets, fair value		$ 66,893