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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 24,865 $ 28,575
Restricted cash 4,151 181
Accounts receivable, net 69 57
Inventories 1,238 855
Prepaid expenses and other current assets 1,995 2,670
Total current assets 32,318 32,338
Property, plant and equipment, net 1,380 1,351
Right-of-use assets 727 946
Total assets 34,425 34,635
Current liabilities    
Accounts payable 1,187 1,774
Accrued expenses 3,269 4,859
Deferred revenue, current 496 525
Lease liabilities, current 409 495
Loan payable, current   382
Convertible notes payable, current   2,000
Total current liabilities 5,361 10,035
Deferred revenue, non-current 1,584 2,072
Lease liabilities, non-current 318 450
Loan payable, non-current 10,834  
Convertible notes payable, non-current 4,602  
Total liabilities 22,699 12,557
Commitments and contingencies (Note 11)
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; 11,707 and 20,631 shares issued and outstanding at September 30, 2021, and December 31, 2020, respectively
Common stock, $.01 par value; 40,000,000 shares authorized; 7,356,289 and 5,996,101 shares issued and outstanding at September 30, 2021, and December 31, 2020, respectively 74 60
Additional paid-in capital 427,301 417,449
Accumulated deficit (415,629) (395,327)
Accumulated other comprehensive loss (20) (104)
Total stockholders' equity 11,726 22,078
Total liabilities and stockholders' equity $ 34,425 $ 34,635