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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 26,600 $ 28,575
Restricted cash 50 181
Accounts receivable, net 75 57
Inventories 1,109 855
Prepaid expenses and other current assets 2,369 2,670
Total current assets 30,203 32,338
Property, plant and equipment, net 1,321 1,351
Right-of-use assets 791 946
Total assets 32,315 34,635
Current liabilities    
Accounts payable 1,234 1,774
Accrued expenses 5,927 5,241
Deferred revenue, current 502 525
Lease liabilities, current 433 495
Convertible notes payable, current 2,000 2,000
Total current liabilities 10,096 10,035
Deferred revenue, non-current 1,856 2,072
Lease liabilities, non-current 357 450
Total liabilities 12,309 12,557
Commitments and contingencies (Note 13)
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; 20,480 and 20,631 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively
Common stock, $.01 par value; 40,000,000 shares authorized; 6,251,257 and 5,996,101 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively 63 60
Additional paid-in capital 422,027 417,449
Accumulated deficit (402,074) (395,327)
Accumulated other comprehensive income (10) (104)
Total stockholders' equity 20,006 22,078
Total liabilities and stockholders' equity $ 32,315 $ 34,635