Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 38,908	$ 62,882
Marketable securities	203,701	145,473
Prepaid expenses	2,331	2,570
Other current assets	1,056	729
Total current assets	245,996	211,654
Property and equipment, net	3,041	3,283
Operating lease right-of-use asset	2,547	2,714
Other assets	282	282
Total assets	251,866	217,933
Current liabilities:
Accounts payable	1,359	2,028
Accrued and other current liabilities	4,378	4,985
Operating lease liabilities, current	1,241	1,199
Total current liabilities	6,978	8,212
Operating lease liabilities, noncurrent	2,898	3,223
Debt, noncurrent	9,675	9,622
Total liabilities	19,551	21,057
Stockholders' equity:
Common stock, $0.001 par value, 125,000,000 shares authorized as of March 31, 2022 (unaudited) and December 31, 2021; 59,564,659 and 56,259,747 shares issued and outstanding as of March 31, 2022 (unaudited) and December 31, 2021, respectively	60	56
Preferred stock, $0.001 par value, 10,000,000 shares authorized, zero shares issued and outstanding as of March 31, 2022 (unaudited) and December 31, 2021	0	0
Additional paid-in capital	429,715	377,765
Accumulated other comprehensive loss	(782)	(291)
Accumulated deficit	(196,678)	(180,654)
Total stockholders' equity	232,315	196,876
Total liabilities and stockholders' equity	$ 251,866	$ 217,933