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Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Current assets      
Cash and cash equivalents $ 15,334 $ 2,516 $ 3,999
Restricted cash 181 1,062 1,325
Accounts receivables, net 12 585 317
Inventories 736 858 1,248
Prepaid expenses and other current assets 864 898 700
Total current assets 17,127 5,919 7,589
Property, plant and equipment, net 756 925 1,298
Right-of-use assets 1,012    
Total assets 18,895 6,844 8,887
Current liabilities      
Accounts payable 4,871 7,715 3,846
Accrued expenses 6,537 7,964 3,408
Convertible notes payable, net of debt discount   2,038 0
Lease liabilities, current portion 656    
Warrant liability 20,410 33 560
Total current liabilities 32,474 17,750 7,814
Deferred revenue 2,890 3,405 0
Lease liabilities, long-term portion 356    
Convertible notes payable, long-term 2,000    
Other non-current liabilities   628 395
Total liabilities 37,720 21,783 8,209
Commitments and contingencies
Stockholders' Equity (Deficit)      
Preferred stock, value 0 0 0
Common stock, value 0 [1] 0 [1],[2] 0 [2]
Additional paid-in capital 364,750 329,065 325,519
Accumulated deficit (383,664) (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 89 50 42
Total stockholders' equity (deficit) (18,825) (14,939) 678
Total liabilities and stockholders' equity (deficit) $ 18,895 $ 6,844 $ 8,887
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018 and a one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.
[2] reflects a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017, a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018, and a one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.