Cash Equivalents and Short-Term Investments - Summary of Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash And Cash Equivalents [Line Items]
Cash equivalents, Fair Value	$ 67,705	$ 41,453
Cash equivalents and short-term investments, Amortized Cost Basis	159,471	193,375
Cash equivalents and short-term investments, Unrealized Gains	2	11
Cash equivalents and short-term investments, Unrealized losses	(9)	(2)
Cash equivalents and short-term investments, Fair Value	159,464	193,384
Short-term investments	91,759	151,931
U.S. Treasury Securities
Cash And Cash Equivalents [Line Items]
Short-term investments Amortized Cost Basis	65,242	126,354
Short-term investments Unrealized Gains	2	11
Short-term investments Unrealized Losses	(9)	(2)
Short-term investments, Fair Value	65,235	126,363
Money Market Funds
Cash And Cash Equivalents [Line Items]
Cash equivalents Amortized Cost Basis	67,705	35,053
Cash equivalents, Fair Value	67,705	35,053
Commercial Paper
Cash And Cash Equivalents [Line Items]
Short-term investments Amortized Cost Basis	21,385	31,968
Short-term investments, Fair Value	21,385	$ 31,968
Corporate Bonds
Cash And Cash Equivalents [Line Items]
Short-term investments Amortized Cost Basis	5,139
Short-term investments, Fair Value	$ 5,139