Balance Sheet Details - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Accounts payable	$ 1,283	$ 2,456
Accrued compensation	2,240	2,804
Accrued research and development	11,743	4,852
Accrued equity issuance costs	0	1,143
Other accrued expenses	632	813
Total	$ 15,898	$ 12,068