Fair Value of Financial Instruments - (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Short-term investments:
Total	$ 104,499	$ 133,778
Corporate commercial paper, bonds and notes
Short-term investments:
Short-term investments:	102,185	75,870
Long-term investments:		23,964
Money market funds
Cash equivalents:
Money market funds	2,314	33,944
Quoted Prices in Active Markets (Level 1)
Short-term investments:
Total	2,314	33,944
Quoted Prices in Active Markets (Level 1) | Corporate commercial paper, bonds and notes
Short-term investments:
Short-term investments:	0	0
Long-term investments:		0
Quoted Prices in Active Markets (Level 1) | Money market funds
Cash equivalents:
Money market funds	2,314	33,944
Other Observable Inputs (Level 2)
Short-term investments:
Total	102,185	99,834
Other Observable Inputs (Level 2) | Corporate commercial paper, bonds and notes
Short-term investments:
Short-term investments:	102,185	75,870
Long-term investments:		23,964
Other Observable Inputs (Level 2) | Money market funds
Cash equivalents:
Money market funds	0	0
Unobservable Inputs (Level 3)
Short-term investments:
Total	0	0
Unobservable Inputs (Level 3) | Corporate commercial paper, bonds and notes
Short-term investments:
Short-term investments:	0	0
Long-term investments:		0
Unobservable Inputs (Level 3) | Money market funds
Cash equivalents:
Money market funds	$ 0	$ 0