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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net (loss) income $ (21,371) $ (8,353)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 199 (40)
Restricted stock compensation expense 4 35
Depreciation expense 168 342
Amortization of right of use assets 1,535 0
Warrant liability fair value adjustment (451) (18,407)
Non-cash interest income (23) (2)
Equitization of expenses 1,474 0
Loss on issuance of financial instrument 1,715 2,826
Interest expense accrued related to convertible notes 33 0
Debt discount amortization 4,467 3,381
Loss on debt extinguishment 0 1,123
Changes in assets and liabilities:    
Prepaid expenses and other assets 43 171
Accounts receivable 564 (60)
Inventories 85 289
Accounts payable and accrued expenses (4,289) 5,662
Deferred revenue (360) 0
Interest payments on financing lease (3) 0
Payments on operating leases (1,485) 0
Other non-current liabilities (627) 139
Net cash used in operating activities (18,322) (12,894)
Cash flows from investing activities:    
Purchase of property, plant and equipment (2) (59)
Net cash used in investing activities (2) (59)
Cash flows from financing activities:    
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
Net proceeds from convertible debt financing 0 5,727
Net cash provided by financing activities 30,330 17,524
Foreign currency effects on cash, cash equivalents and restricted cash (69) 80
Net increase in cash, cash equivalents and restricted cash 11,937 4,651
Cash, cash equivalents and restricted cash:    
Beginning of period 3,578 5,324
End of period 15,515 9,975
Supplemental non-cash financing activities:    
Fair value of warrants issued 20,844 28,539
Series D Preferred Stock [Member]    
Cash flows from financing activities:    
Net proceeds from sale of Series D Preferred Stock 150 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