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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current assets    
Cash and cash equivalents $ 16,340 $ 22,802
Restricted cash 4,151 4,151
Accounts receivable, net 178 44
Inventories 2,011 1,412
Prepaid expenses and other current assets 2,704 2,743
Total current assets 25,384 31,152
Property, plant and equipment, net 1,406 1,348
Right-of-use assets 527 624
Total assets 27,317 33,124
Current liabilities    
Accounts payable 1,243 638
Accrued expenses 4,495 4,109
Deferred revenue, current 0 170
Lease liabilities, current 404 416
Loan payable, current 2,520 621
Total current liabilities 8,662 5,954
Lease liabilities, non-current 122 207
Loan payable, non-current 8,633 10,372
Convertible notes payable, non-current 4,675 4,639
Total liabilities 22,092 21,172
Commitments and contingencies (Note 13)
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; 11,357 shares issued and outstanding at March 31, 2022 and December 31, 2021
Common stock, $.01 par value; 40,000,000 shares authorized; 7,906,728 shares issued and outstanding at March 31, 2022 and December 31, 2021 79 79
Additional paid-in capital 434,305 432,831
Accumulated deficit (429,179) (420,976)
Accumulated other comprehensive income 20 18
Total stockholders' equity 5,225 11,952
Total liabilities and stockholders' equity $ 27,317 $ 33,124