CONDENSED CONSOLIDATED BALANCE SHEETS UNAUDITED - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 2,817	$ 2,356
Short-term investments	0	1,991
Unbilled receivables	0	30
Prepaid expenses and other current assets	545	641
Total current assets	3,362	5,018
Restricted cash	264	264
Property and equipment, net	594	775
Right-of-use assets, net	1,769	1,961
Other assets	53	67
Total assets	6,042	8,085
Current Liabilities:
Accounts payable	381	109
Accrued expenses	1,944	926
Current portion of lease liabilities	651	575
Convertible note payable, net of issuance costs (Note 9)	977	0
Total current liabilities	3,953	1,610
Lease liabilities, net of current portion	1,697	2,075
Total liabilities	5,650	3,685
Commitments and contingencies (Note 10)
Stockholders’ Equity:
Preferred stock ($0.01 par value per share); 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock ($0.01 par value per share); 60,000,000 shares authorized at September 30, 2023 and December 31, 2022; 11,901,780 and 4,944,202 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively	119	49
Additional paid-in capital	411,406	404,277
Accumulated other comprehensive loss	(247)	(229)
Accumulated deficit	(410,886)	(399,697)
Total stockholders’ equity	392	4,400
Total liabilities and stockholders’ equity	$ 6,042	$ 8,085