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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 264 $ 2,516
Restricted cash 1,062 1,062
Accounts receivables, net 62 585
Inventories 775 858
Prepaid expenses and other current assets 1,003 898
Total current assets 3,166 5,919
Property, plant and equipment, net 861 925
Right-of-use assets 2,137  
Total assets 6,164 6,844
Current liabilities    
Accounts payable 10,268 7,715
Accrued expenses 8,360 7,964
Notes payable, net of debt discount 5,390  
Convertible notes payable, net of debt discount 367 2,038
Lease liabilities, current portion 1,024  
Warrant liability 26 33
Total current liabilities 25,435 17,750
Deferred revenue 3,223 3,405
Lease liabilities, long-term portion 1,117  
Other non-current liabilities 166 628
Total liabilities 29,941 21,783
Commitments and Contingencies
Stockholders' deficit    
Preferred stock, $.01 par value; 10,000,000 shares authorized; no shares and 101 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively 0 0
Common stock, $.01 par value; 1,000,000,000 shares authorized; 14,434,454 and 10,299,954 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively* [1] 144 103
Additional paid-in capital 327,969 328,962
Accumulated deficit (351,947) (344,054)
Accumulated other comprehensive income 57 50
Total stockholders' deficit (23,777) (14,939)
Total liabilities and stockholders' deficit $ 6,164 $ 6,844
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.