Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 87,049	$ 110,537
Short-term investments	133,913	143,222
Unbilled grant receivable	1,700	2,336
Prepaid expenses and other current assets	6,310	4,704
Total current assets	228,972	260,799
Restricted cash	210
Property and equipment, net	4,291	3,757
Operating lease right-of-use asset	1,586	1,460
Long-term investments	39,071	65,936
Other long-term assets	55	56
Total assets	274,185	332,008
Current liabilities:
Accounts payable	751	567
Accrued liabilities	9,197	8,437
Current operating lease liability	316	288
Total current liabilities	10,264	9,292
Operating lease liability, less current portion	1,672	1,632
Total liabilities	11,936	10,924
Stockholders' equity:
Common stock, $0.0001 par value; 900,000,000 shares authorized at September 30, 2022 and December 31, 2021, respectively; 37,817,724 and 37,379,077 shares issued and outstanding at September 30, 2022 and December 31,2021, respectively	4	4
Additional paid-in capital	426,116	417,363
Accumulated other comprehensive loss	(2,472)	(388)
Accumulated deficit	(161,399)	(95,895)
Total stockholders' equity	262,249	321,084
Total liabilities and stockholders' equity	$ 274,185	$ 332,008