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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Current assets    
Cash and cash equivalents $ 10,203 $ 22,802
Restricted cash 4,151 4,151
Accounts receivable, net 438 44
Inventories 2,040 1,412
Prepaid expenses and other current assets 2,370 2,743
Total current assets 19,202 31,152
Property, plant and equipment, net 1,457 1,348
Right-of-use assets 407 624
Total assets 21,066 33,124
Current liabilities    
Accounts payable 2,067 638
Accrued expenses 5,417 4,109
Deferred revenue 0 170
Lease liabilities 294 416
Loan payable, current 4,474 621
Total current liabilities 12,252 5,954
Lease liabilities, non-current 113 207
Loan payable, non-current 6,838 10,372
Convertible notes payable, non-current 4,709 4,639
Total liabilities 23,912 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 June 30, 2022 and December 31, 2021
Common stock, $.01 par value; 40,000,000 shares authorized; 7,906,728 shares issued and outstanding at June 30, 2022 and December 31, 2021 79 79
Additional paid-in capital 435,922 432,831
Accumulated deficit (438,836) (420,976)
Accumulated other comprehensive (loss) income (11) 18
Total stockholders' equity (deficit) (2,846) 11,952
Total liabilities and stockholders' equity $ 21,066 $ 33,124