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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Current assets    
Cash and cash equivalents $ 7,671 $ 22,802
Restricted cash 4,151 4,151
Accounts receivable, net 366 44
Inventories 1,998 1,412
Prepaid expenses and other current assets 1,969 2,743
Total current assets 16,155 31,152
Property, plant and equipment, net 1,422 1,348
Right-of-use assets 285 624
Total assets 17,862 33,124
Current liabilities    
Accounts payable 2,018 638
Accrued expenses 4,685 4,109
Deferred revenue 0 170
Lease liabilities, current 186 416
Loan payable, current 7,846 621
Total current liabilities 14,735 5,954
Other liabilities, non-current 1,144 207
Loan payable, non-current 3,070 10,372
Convertible notes payable, non-current 4,772 4,639
Total liabilities 23,721 21,172
Commitments and contingencies 0 0
Stockholders' equity (deficit)    
Preferred stock, $.01 par value; 10,000,000 shares authorized; 11,357 shares issued and outstanding at December 31, 2022 and 2021
Common stock, $.01 par value; 40,000,000 shares authorized; 10,046,571 shares and 7,906,728 shares issued and outstanding at December 31, 2022 and 2021, respectively 100 79
Additional paid-in capital 451,608 432,831
Accumulated deficit (457,484) (420,976)
Accumulated other comprehensive (loss) income (83) 18
Total stockholders' equity (deficit) (5,859) 11,952
Total liabilities and stockholders' equity (deficit) $ 17,862 $ 33,124