Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash	$ 1,241	$ 1,242
Restricted cash		50
Prepaid research and development	274
Prepaid expenses and other current assets	79	295
Total current assets	1,594	1,587
Property, plant and equipment, net	49	110
Right-of-use assets, net	147	169
Deferred financing costs	610
Total assets	2,400	1,866
Current liabilities:
Accounts payable	682	676
Accrued and other current liabilities	582	798
Accrual for contingency matter		3,250
Warrant liability		2
Current portion of operating lease liability	99	110
Total current liabilities	1,363	4,836
Operating lease liability, net of current portion	48	59
Total liabilities	1,411	4,895
Commitments and contingencies (Note 9)
Series E convertible preferred stock, $0.01 par value per share, 5,000 shares authorized, 4,180 shares issued and outstanding	4,180
Stockholders’ deficit:
Common stock, par value $0.01 per share, 60,000,000 shares authorized; 12,174,467 and 10,760,871 issued and outstanding at December 31, 2022 and 2021, respectively	122	108
Additional paid-in capital	79,698	73,801
Accumulated deficit	(83,011)	(76,938)
Total stockholders’ deficit	(3,191)	(3,029)
Total liabilities and stockholders’ deficit	$ 2,400	$ 1,866