Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 14,305	$ 33,091
Short-term marketable securities	78,209	68,760
Prepaid expenses and other current assets	3,165	3,338
Total current assets	95,679	105,189
Property and equipment, net	4,672	4,794
Operating lease right-of-use assets	4,215	4,582
Long-term marketable securities	11,780	21,655
Restricted cash	405	405
Other assets	904	549
Total assets	117,655	137,174
Current liabilities:
Accounts payable	1,045	2,718
Accrued and other liabilities	4,927	8,662
Lease liabilities, current portion	2,143	2,193
Total current liabilities	8,115	13,573
Lease liabilities, noncurrent portion	5,074	5,600
Warrant liabilities	1,804	8,301
Total liabilities	14,993	27,474
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000 shares authorized; no shares issued and outstanding as of March 31, 2022 and December 31, 2021	0	0
Common stock, $0.0001 par value, 500,000 shares authorized as of March 31, 2022 and December 31, 2021; 35,127 and 35,034 shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively	4	4
Additional paid-in-capital	253,683	252,464
Accumulated other comprehensive loss	(429)	(119)
Accumulated deficit	(150,596)	(142,649)
Total stockholders' equity	102,662	109,700
Total liabilities and stockholders’ equity	$ 117,655	$ 137,174