CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 1,242	$ 1,026
Restricted cash	50	50
Grant receivable	0	77
Prepaid expenses and other current assets	295	524
Total current assets	1,587	1,677
Property, plant and equipment, net	110	217
Right-of-use assets, net	169	182
Total assets	1,866	2,076
Current liabilities:
Accounts payable	676	31
Accrued and other current liabilities	798	317
Accrual for contingency matter	3,250	0
Current portion of notes payable	0	284
Warrant liability	2	17
Current portion of operating lease liability	110	107
Total current liabilities	4,836	756
Notes payable, net of current portion	0	120
Operating lease liability, net of current portion	59	75
Total liabilities	4,895	951
Commitments and contingencies (Note 9)
Stockholders' (deficit) equity:
Preferred stock, $0.01 par value; 2,000,000 shares authorized and none issued and outstanding	0	0
Common stock, par value $0.01 per share, 60,000,000 shares authorized; 10,760,871 and 9,388,407 issued and outstanding at December 31, 2021 and 2020, respectively	108	94
Additional paid-in capital	73,801	69,991
Accumulated deficit	(76,938)	(68,960)
Total stockholders' (deficit) equity	(3,029)	1,125
Total liabilities and stockholders' equity	$ 1,866	$ 2,076