Balance Sheet Details - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Prepaid Expense and Other Assets [Abstract]
Refundable withholding tax	$ 3,375
Prepaid insurance	473	$ 505
Prepaid clinical costs	188	820
Prepaid manufacturing costs	113	930
Other prepaid expenses and current assets	1,607	1,133
Total prepaid expenses and other current assets	$ 5,756	$ 3,388