Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value On Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Cash equivalents:
Cash equivalents	$ 154,895	$ 95,503
Short-term investments:
Short-term investments	168,347	233,663	$ 168,300
Money Market Fund
Cash equivalents:
Cash equivalents	114,896	55,505
U.S. Government Treasury Securities
Cash equivalents:
Cash equivalents	39,999	39,998
U.S. Government Treasury Securities
Short-term investments:
Short-term investments	168,347	233,663
Level 1
Cash equivalents:
Cash equivalents	154,895	95,503
Short-term investments:
Short-term investments	168,347	233,663
Level 1 | Money Market Fund
Cash equivalents:
Cash equivalents	114,896	55,505
Level 1 | U.S. Government Treasury Securities
Cash equivalents:
Cash equivalents	39,999	39,998
Level 1 | U.S. Government Treasury Securities
Short-term investments:
Short-term investments	$ 168,347	$ 233,663