Fair Value Measurements - Assets measured at fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Assets	$ 194,568	$ 156,782
Cash equivalents
Assets
Assets	172,183	156,782
Commercial paper
Assets
Assets	959
Corporate debt securities
Assets
Assets	18,822
U.S. government securities
Assets
Assets	2,604
Level 1
Assets
Assets	172,183	156,782
Level 1 | Cash equivalents
Assets
Assets	172,183	$ 156,782
Level 2
Assets
Assets	22,385
Level 2 | Commercial paper
Assets
Assets	959
Level 2 | Corporate debt securities
Assets
Assets	18,822
Level 2 | U.S. government securities
Assets
Assets	$ 2,604