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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:        
Net loss $ (21,371) $ (8,353) $ (19,222) $ (45,117)
Adjustments to reconcile net loss to net cash used in operating activities:        
Stock option compensation expense 199 (40) (40) 50
Restricted stock compensation expense 4 35 98 79
Depreciation expense 168 342 444 310
Loss on disposal of equipment     0 18
Warrant liability fair value adjustment (451) (18,407) (19,706) (15,103)
Gain on warrant extinguishment 0 1,123 0 (9,613)
Non-cash interest income (23) (2) (1) (1)
Interest expense accrued related to convertible notes 33 0 402 0
Debt discount and deferred finance costs amortization     7,572 21,544
Loss on issuance of financial instrument 1,721 2,826 2,826 0
Loss on debt settlements and extinguishments     1,123 29,924
Amortization of right of use assets 1,535 0    
Equitization of expenses 1,474 0    
Loss on issuance of financial instrument 1,715 2,826    
Debt discount amortization 4,467 3,381    
Changes in assets and liabilities:        
Prepaid expenses and other assets 43 171 (218) 7
Accounts receivable 564 (60) (293) 108
Inventories 85 289 385 (543)
Accounts payable and accrued expenses (4,289) 5,662 8,163 3,180
Deferred revenue (360) 0 3,503 (32)
Interest payments on financing lease (3) 0    
Payments on operating leases (1,485) 0    
Other non-current liabilities (627) 139 232 (209)
Net cash used in operating activities (18,322) (12,894) (14,732) (15,398)
Cash flows from investing activities:        
Purchase of property, plant and equipment (2) (59) (76) (524)
Net cash (used in) provided by investing activities (2) (59) (76) (524)
Cash flows from financing activities:        
Expenses from the release of restricted cash     0 (1,212)
Cash paid pursuant to Exchange Agreement     0 (804)
Net proceeds from convertible note debt financing 0 5,727 5,664 0
Net proceeds from sale of stock     10,917 15
Net proceeds from exercise of warrants     520 0
Repayment of convertible note debt     (4,870) 0
Net cash provided by (used in) financing activities 30,330 17,524 13,236 (10,517)
Net proceeds from the issuance of debt 3,719 0    
Principal payments on financing leases (49) 0    
Net proceeds from sale of common stock and warrants 0 11,797    
Foreign currency effects on cash, cash equivalents and restricted cash (69) 80 (174) 67
Net increase in cash, cash equivalents and restricted cash 11,937 4,651 (1,746) (26,372)
Cash, cash equivalents and restricted cash:        
Beginning of period 3,578 5,324 5,324 31,696
End of period 15,515 9,975 3,578 5,324
Supplemental non-cash financing activities:        
Conversion of convertible notes     0 40,121
Fair value of warrants issued 20,844 28,539 28,539 16,953
Cashless exercise of warrants     0 2,537
Deemed dividend     0 527
Fair value of warrants exercised for cash     0 19
Series B and Series C Preferred Shares [Member]        
Cash flows from financing activities:        
Net proceeds from sale of Preferred Stock     0 2,310
Series A and Series B Preferred Shares [Member]        
Cash flows from financing activities:        
Cash paid to redeem preferred shares     0 (2,360)
Series C Preferred Shares [Member]        
Cash flows from financing activities:        
Cash paid to redeem preferred shares     0 (590)
Series D Preferred Shares [Member]        
Cash flows from financing activities:        
Net proceeds from sale of Preferred Stock 150 0 1,005 0
Series E Preferred Stock and Warrants [Member]        
Cash flows from financing activities:        
Net proceeds from sale of Series E Preferred Stock and warrants $ 26,510 $ 0    
Series C Warrants [Member]        
Cash flows from financing activities:        
Cash paid to extinguish of Series C Warrants     $ 0 $ (7,876)