Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 33,035	$ 48,910
Short-term investments	29,654	27,517
Prepaid expenses and other current assets	4,047	2,313
Total current assets	66,736	78,740
Property and equipment, net		347
Operating lease right-of-use asset		902
Total assets	66,736	79,989
Current liabilities:
Accounts payable	264	368
Accrued liabilities	5,209	6,567
Current portion of operating lease liability		825
Total current liabilities	5,473	7,760
Operating lease liability, net of current portion		181
Long-term debt, net of debt discount	13,425	13,303
Other long-term liabilities	1,388	1,390
Commitments and contingencies (Note 3)
Stockholders’ equity:
Preferred stock, $0.0001 par value; authorized shares – 10,000,000 at March 31, 2022 and December 31, 2021, respectively; issued and outstanding shares – none at March 31, 2022 and December 31, 2021
Common stock, $0.0001 par value; authorized shares – 200,000,000 at March 31, 2022 and December 31, 2021, respectively; issued shares – 42,163,510 and 42,110,560 at March 31, 2022 and December 31, 2021, respectively; outstanding shares – 42,163,510 and 42,108,428 at March 31, 2022 and December 31, 2021, respectively	4	4
Additional paid-in-capital	242,322	240,309
Accumulated other comprehensive loss	(43)	(5)
Accumulated deficit	(195,833)	(182,953)
Total stockholders’ equity	46,450	57,355
Total liabilities and stockholders’ equity	$ 66,736	$ 79,989