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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 19,274 $ 28,575
Restricted cash 151 181
Accounts receivable, net 75 57
Inventories 1,221 855
Prepaid expenses and other current assets 2,185 2,670
Total current assets 22,906 32,338
Property, plant and equipment, net 1,361 1,351
Right-of-use assets 650 946
Total assets 24,917 34,635
Current liabilities    
Accounts payable 1,224 1,774
Accrued expenses 3,621 5,241
Deferred revenue, current 509 525
Lease liabilities, current 387 495
Convertible notes payable, current   2,000
Total current liabilities 5,741 10,035
Deferred revenue, non-current 1,754 2,072
Lease liabilities, non-current 263 450
Total liabilities 9,758 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 June 30, 2021, and December 31, 2020, respectively
Common stock, $.01 par value; 40,000,000 shares authorized; 7,349,777 and 5,996,101 shares issued and outstanding at June 30, 2021, and December 31, 2020, respectively 74 60
Additional paid-in capital 423,660 417,449
Accumulated deficit (408,504) (395,327)
Accumulated other comprehensive loss (71) (104)
Total stockholders' equity 15,159 22,078
Total liabilities and stockholders' equity 24,917 $ 34,635
Convertible notes payable, non-current $ 2,000