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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 15,334 $ 2,516
Restricted cash 181 1,062
Accounts receivables, net 12 585
Inventories 736 858
Prepaid expenses and other current assets 864 898
Total current assets 17,127 5,919
Property, plant and equipment, net 756 925
Right-of-use assets 1,012  
Total assets 18,895 6,844
Current liabilities    
Accounts payable 4,871 7,715
Accrued expenses 6,537 7,964
Convertible notes payable, net of debt discount   2,038
Lease liabilities, current portion 656  
Warrant liability 20,410 33
Total current liabilities 32,474 17,750
Deferred revenue 2,890 3,405
Lease liabilities, long-term portion 356  
Convertible notes payable, long-term 2,000  
Other non-current liabilities   628
Total liabilities 37,720 21,783
Commitments and contingencies
Stockholders' deficit    
Preferred stock, $.01 par value; 10,000,000 shares authorized; 42,082 and 101 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively 0 0
Common stock, $.01 par value; 1,000,000,000 shares authorized; 18,277,807 and 10,299,954 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively* [1] 183 103
Additional paid-in capital 364,567 328,962
Accumulated deficit (383,664) (344,054)
Accumulated other comprehensive income 89 50
Total stockholders' deficit (18,825) (14,939)
Total liabilities and stockholders' deficit $ 18,895 $ 6,844
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.