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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Current assets    
Cash and cash equivalents $ 9,831 $ 22,802
Restricted cash 4,151 4,151
Accounts receivable, net 537 44
Inventories 1,926 1,412
Prepaid expenses and other current assets 2,035 2,743
Total current assets 18,480 31,152
Property, plant and equipment, net 1,452 1,348
Right-of-use assets 294 624
Total assets 20,226 33,124
Current liabilities    
Accounts payable 2,632 638
Accrued expenses 5,137 4,109
Deferred revenue 0 170
Lease liabilities, current 196 416
Loan payable, current 6,481 621
Total current liabilities 14,446 5,954
Other liabilities, non-current 1,299 207
Loan payable, non-current 4,990 10,372
Convertible notes payable, non-current 4,737 4,639
Total liabilities 25,472 21,172
Commitments and contingencies
Stockholders' equity (deficit)    
Preferred stock, $.01 par value; 10,000,000 shares authorized; 11,357 shares issued and outstanding at September 30, 2022 and December 31, 2021
Common stock, $.01 par value; 40,000,000 shares authorized; 8,597,682 shares and 7,906,728 shares issued and outstanding at September 30, 2022 and December 31, 2021, respectively 86 79
Additional paid-in capital 442,066 432,831
Accumulated deficit (447,341) (420,976)
Accumulated other comprehensive (loss) income (57) 18
Total stockholders' equity (deficit) (5,246) 11,952
Total liabilities and stockholders' equity (deficit) $ 20,226 $ 33,124