Balance Sheet Accounts - Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Prepaid income taxes	$ 112	$ 1,173
Prepaid FDA user fee and advances to clinical research organization	369	1,108
Prepaid insurance	1,568	196
Advances to commercial manufacturers	2,043	2,354
Prepaid R&D	106	0
Convertible promissory note, net	6,210	5,312
Other receivable related to cost sharing arrangement with commercial partner	951	347
All other	2,903	1,400
Total prepaid expenses and other current assets	$ 14,262	$ 11,890