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Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Current assets      
Cash and cash equivalents $ 352 $ 2,516 $ 3,999
Restricted cash 1,062 1,062 1,325
Accounts receivables, net 180 585 317
Inventories 687 858 1,248
Prepaid expenses and other current assets 664 898 700
Total current assets 2,945 5,919 7,589
Property, plant and equipment, net 805 925 1,298
Right-of-use assets 1,886    
Total assets 5,636 6,844 8,887
Current liabilities      
Accounts payable 10,713 7,715 3,846
Accrued expenses 9,119 7,964 3,408
Notes payable, net of debt discount 9,838    
Convertible notes payable, net of debt discount 523 2,038 0
Lease liabilities, current portion 1,050    
Warrant liability 9 33 560
Total current liabilities 31,252 17,750 7,814
Deferred revenue 3,143 3,405 0
Lease liabilities, long-term portion 848    
Other non-current liabilities 122 628 395
Total liabilities 35,365 21,783 8,209
Commitments and contingencies
Stockholders' Equity (Deficit)      
Preferred stock, value 0 0 0
Common stock, value 183 [1] 103 [1],[2] 2 [2]
Additional paid-in capital 328,018 328,962 325,517
Accumulated deficit (357,907) (344,054) (324,832)
Treasury stock, at cost; 0 and 1 share at December 31, 2018 and December 31, 2017, respectively* [2]   0 (51)
Accumulated other comprehensive income (loss) (23) 50 42
Total stockholders' equity (deficit) (29,729) (14,939) 678
Total liabilities and stockholders' equity (deficit) $ 5,636 $ 6,844 $ 8,887
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.
[2] reflects a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017 and a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.