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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 22,802 $ 28,575
Restricted cash 4,151 181
Accounts receivable, net 44 57
Inventories 1,412 855
Prepaid expenses and other current assets 2,743 2,670
Total current assets 31,152 32,338
Property, plant and equipment, net 1,348 1,351
Right-of-use assets 624 946
Total assets 33,124 34,635
Current liabilities    
Accounts payable 638 1,774
Accrued expenses 4,109 5,241
Deferred revenue, current 170 525
Lease liabilities, current 416 495
Loan payable, current 621  
Convertible notes payable, current   2,000
Total current liabilities 5,954 10,035
Deferred revenue, non-current   2,072
Lease liabilities, non-current 207 450
Loan payable, non-current 10,372  
Convertible notes payable, non-current 4,639  
Total liabilities 21,172 12,557
Commitments and contingencies (Note 13)
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; 11,357 and 20,631 shares issued and outstanding at December 31, 2021 and 2020, respectively
Common stock, $.01 par value; 40,000,000 shares authorized; 7,906,728 and 5,996,101 shares issued and outstanding at December 31, 2021 and 2020, respectively 79 60
Additional paid-in capital 432,831 417,449
Accumulated deficit (420,976) (395,327)
Accumulated other comprehensive loss 18 (104)
Total stockholders' equity 11,952 22,078
Total liabilities and stockholders' equity $ 33,124 $ 34,635