Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 105,387	$ 62,882
Marketable securities	201,451	145,473
Prepaid expenses	3,805	2,570
Other current assets	685	729
Total current assets	311,328	211,654
Property and equipment, net	3,518	3,283
Operating lease right-of-use asset	2,374	2,714
Other assets	282	282
Total assets	317,502	217,933
Current liabilities:
Accounts payable	1,922	2,028
Accrued and other current liabilities	4,646	4,985
Operating lease liabilities, current	1,285	1,199
Total current liabilities	7,853	8,212
Operating lease liabilities, noncurrent	2,557	3,223
Debt, noncurrent	9,728	9,622
Total liabilities	20,138	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	68	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	511,325	377,765
Accumulated other comprehensive loss	(1,164)	(291)
Accumulated deficit	(212,865)	(180,654)
Total stockholders' equity	297,364	196,876
Total liabilities and stockholders' equity	$ 317,502	$ 217,933