Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Total available for sale investments	$ 109,310	$ 128,878
Recurring basis
Assets:
Total included in cash and cash equivalents	19,029	10,990
Total available for sale investments	109,310	128,878
Total assets measured at fair value on a recurring basis	128,339	139,868
Recurring basis | Certificate of deposit
Assets:
Total available for sale investments	9,239	1,260
Recurring basis | Corporate debt securities
Assets:
Total available for sale investments	69,664	88,390
Recurring basis | Commercial paper
Assets:
Total available for sale investments	10,468	14,454
Recurring basis | Non U.S. government
Assets:
Total available for sale investments		728
Recurring basis | U.S. treasury securities
Assets:
Total available for sale investments	19,939	24,046
Recurring basis | Money market fund
Assets:
Total included in cash and cash equivalents	15,824	10,990
Recurring basis | Corporate debt securities
Assets:
Total included in cash and cash equivalents	3,205
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Assets:
Total included in cash and cash equivalents	15,824	10,990
Total available for sale investments	19,939	24,046
Total assets measured at fair value on a recurring basis	35,763	35,036
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Certificate of deposit
Assets:
Total available for sale investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Corporate debt securities
Assets:
Total available for sale investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Commercial paper
Assets:
Total available for sale investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Non U.S. government
Assets:
Total available for sale investments		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | U.S. treasury securities
Assets:
Total available for sale investments	19,939	24,046
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Money market fund
Assets:
Total included in cash and cash equivalents	15,824	10,990
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Corporate debt securities
Assets:
Total included in cash and cash equivalents	0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Total included in cash and cash equivalents	3,205	0
Total available for sale investments	89,371	104,832
Total assets measured at fair value on a recurring basis	92,576	104,832
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificate of deposit
Assets:
Total available for sale investments	9,239	1,260
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Assets:
Total available for sale investments	69,664	88,390
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper
Assets:
Total available for sale investments	10,468	14,454
Recurring basis | Significant Other Observable Inputs (Level 2) | Non U.S. government
Assets:
Total available for sale investments		728
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasury securities
Assets:
Total available for sale investments	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Money market fund
Assets:
Total included in cash and cash equivalents	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Assets:
Total included in cash and cash equivalents	3,205
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Total included in cash and cash equivalents	0	0
Total available for sale investments	0	0
Total assets measured at fair value on a recurring basis	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Certificate of deposit
Assets:
Total available for sale investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Assets:
Total available for sale investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Commercial paper
Assets:
Total available for sale investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Non U.S. government
Assets:
Total available for sale investments		0
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. treasury securities
Assets:
Total available for sale investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Money market fund
Assets:
Total included in cash and cash equivalents	0	$ 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Assets:
Total included in cash and cash equivalents	$ 0