Condensed Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 68,568	$ 44,687
Short-term marketable securities	21,585	90,411
Prepaid expenses and other current assets	3,884	2,597
Total current assets	94,037	137,695
Property and equipment, net	8,247	9,248
Long-term marketable securities	0	1,522
Operating lease right-of-use assets	5,798	6,127
Other assets	869	860
Total assets	108,951	155,452
Current liabilities
Accounts payable	2,790	2,666
Accrued liabilities	17,162	17,362
Deferred revenue, current	36,504	37,462
Operating lease liabilities, current	1,767	1,649
Total current liabilities	58,223	59,139
Deferred revenue, noncurrent	14,454	27,705
Operating lease liabilities, net of current portion	9,632	10,538
Total liabilities	82,309	97,382
Commitments and contingencies (Note 6)
Stockholders' equity
Common stock, $0.0001 par value; 150,000,000 shares authorized at June 30, 2022 and December 31, 2021; 33,105,312 shares and 32,765,788 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	4	4
Additional paid-in capital	349,158	342,905
Accumulated other comprehensive loss	(56)	(47)
Accumulated deficit	(322,464)	(284,792)
Total stockholders' equity	26,642	58,070
Total liabilities and stockholders' equity	$ 108,951	$ 155,452