Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Total assets	$ 95,003
Liabilities:
Total liabilities		$ 1,169
Convertible Preferred Stock Warrants Liability
Liabilities:
Total liabilities		1,169
Money Market Funds
Assets
Total assets	95,003
Level 1
Assets
Total assets	95,003
Level 1 | Money Market Funds
Assets
Total assets	$ 95,003
Level 3
Liabilities:
Total liabilities		1,169
Level 3 | Convertible Preferred Stock Warrants Liability
Liabilities:
Total liabilities		$ 1,169