Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 55,291	$ 92,046
Short-term marketable securities	197,308	154,724
Accounts receivable	697	1,103
Prepaid expenses and other current assets	2,753	3,123
Total current assets	256,049	250,996
Restricted cash	106	106
Long-term marketable securities	93,628	121,293
Property and equipment, net	5,274	4,763
Right-of-use assets	3,554	3,898
Other non-current assets	256	291
Total assets	358,867	381,347
Current liabilities
Accounts payable	3,364	2,100
Accrued liabilities	12,628	12,320
Contract liability	39,224	29,040
Operating lease liabilities - current	1,741	1,699
Total current liabilities	56,957	45,159
Long-term contract liability	10,212	31,192
Long-term operating lease liabilities	3,031	3,482
Total liabilities	70,200	79,833
Commitments and contingencies (Note 5)
Stockholders’ equity
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of March 31, 2022 and December 31, 2021; no shares issued and outstanding as of March 31, 2022 and December 31, 2021
Common stock, $0.0001 par value, 300,000,000 shares authorized as of March 31, 2022 and December 31, 2021; 38,639,922 and 38,533,045 shares issued and outstanding as of March 31, 2022 and December 31, 2021	4	4
Additional paid-in capital	482,228	478,970
Accumulated other comprehensive loss	(2,804)	(712)
Accumulated deficit	(190,761)	(176,748)
Total stockholders’ equity	288,667	301,514
Total liabilities and stockholders’ equity	$ 358,867	$ 381,347