Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value On Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash equivalents:
Cash equivalents	$ 95,503	$ 56,434
Short-term investments:
Short-term investments	233,663	64,993
Money Market Fund
Cash equivalents:
Cash equivalents	55,505	46,407
U.S. Government Treasury Securities
Cash equivalents:
Cash equivalents	39,998
Demand Deposits
Cash equivalents:
Cash equivalents		10,027
U.S. Government Treasury Securities
Short-term investments:
Short-term investments	233,663	64,993
Level 1
Cash equivalents:
Cash equivalents	95,503	56,434
Short-term investments:
Short-term investments	233,663	64,993
Level 1 | Money Market Fund
Cash equivalents:
Cash equivalents	55,505	46,407
Level 1 | U.S. Government Treasury Securities
Cash equivalents:
Cash equivalents	39,998
Level 1 | Demand Deposits
Cash equivalents:
Cash equivalents		10,027
Level 1 | U.S. Government Treasury Securities
Short-term investments:
Short-term investments	$ 233,663	$ 64,993