Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 22,925	$ 31,230
Insurance recovery of legal settlement	450	450
Prepaid expenses and other current assets	1,298	1,270
Total current assets	24,673	32,950
Property and equipment-net	1,008	1,060
Operating lease right-of-use assets	11,219	11,650
Other noncurrent assets	429	429
Total assets	37,329	46,089
Current liabilities:
Accounts payable	1,157	1,108
Accrued legal settlement	450	450
Accrued expenses	2,538	2,961
Current loan payable (net of discount and issuance costs of $58 and nil, respectively)	1,481
Current operating lease liabilities	1,325	1,413
Accrued compensation	456	1,248
Interest payable	104	97
Total current liabilities	7,511	7,277
Loan payable (net of discount and issuance costs of $454 and $756, respectively)	8,935	10,371
Operating lease liabilities, less current portion	9,918	10,330
Total liabilities	26,364	27,978
Commitments and contingencies (Note 5)
Stockholders' equity:
Common stock, $0.001 par value; 100,000,000 shares authorized at March 31, 2022 and December 31, 2021; 7,173,094 and 6,910,324 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	11	11
Additional paid-in capital	154,362	153,872
Accumulated deficit	(143,408)	(135,772)
Total stockholders’ equity	10,965	18,111
Total liabilities and stockholders’ equity	$ 37,329	$ 46,089