Condensed Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 50,738	$ 44,687
Short-term marketable securities	61,727	90,411
Prepaid expenses and other current assets	4,480	2,597
Total current assets	116,945	137,695
Property and equipment, net	8,722	9,248
Long-term marketable securities	0	1,522
Operating lease right-of-use asset	5,967	6,127
Other assets	813	860
Total assets	132,447	155,452
Current liabilities
Accounts payable	4,189	2,666
Accrued liabilities	15,812	17,362
Deferred revenue, current	36,875	37,462
Operating lease liabilities, current	1,707	1,649
Total current liabilities	58,583	59,139
Deferred revenue, noncurrent	22,386	27,705
Operating lease liabilities, net of current portion	10,094	10,538
Total liabilities	91,063	97,382
Commitments and contingencies (Note 6)
Stockholders' equity
Common stock, $0.0001 par value; 150,000,000 shares authorized at September 30, 2021 and December 31, 2020; 32,740,925 shares and 25,553,172 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	4	4
Additional paid-in capital	346,581	342,905
Accumulated other comprehensive loss	(88)	(47)
Accumulated deficit	(305,113)	(284,792)
Total stockholders' equity	41,384	58,070
Total liabilities and stockholders' equity	$ 132,447	$ 155,452