Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value On Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Cash equivalents:
Cash equivalents	$ 73,134	$ 56,434
Short-term investments:
Short-term investments	26,184	64,993
U.S. Treasury Securities and Government Treasury Securities
Short-term investments:
Short-term investments	26,184
U.S. Government Treasury Bills and Bonds
Short-term investments:
Short-term investments		64,993
Level 1
Cash equivalents:
Cash equivalents	73,134	56,434
Short-term investments:
Short-term investments	26,184	64,993
Level 1 | U.S. Treasury Securities and Government Treasury Securities
Short-term investments:
Short-term investments	26,184
Level 1 | U.S. Government Treasury Bills and Bonds
Short-term investments:
Short-term investments		64,993
Money Market Fund
Cash equivalents:
Cash equivalents	53,139	46,407
Money Market Fund | Level 1
Cash equivalents:
Cash equivalents	53,139	46,407
Demand Deposit
Cash equivalents:
Cash equivalents		10,027
Demand Deposit | Level 1
Cash equivalents:
Cash equivalents		$ 10,027
U.S. Treasury Securities
Cash equivalents:
Cash equivalents	19,995
U.S. Treasury Securities | Level 1
Cash equivalents:
Cash equivalents	$ 19,995