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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net (loss) income $ (13,853) $ 527
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 129 (40)
Restricted stock compensation expense 4 (81)
Depreciation expense 122 236
Amortization of right of use assets 552 0
Warrant liability fair value adjustment (17) (17,209)
Non-cash interest income 0 (1)
Loss on issuance of financial instrument 6 2,826
Interest expense accrued related to convertible notes 329 0
Debt discount amortization 3,444 238
Changes in assets and liabilities:    
Prepaid expenses and other assets 232 318
Accounts receivable 404 (163)
Inventories 143 43
Accounts payable and accrued expenses 3,827 3,985
Deferred revenue (240) 0
Other non-current liabilities (504) 44
Principal payments on leases (540) 0
Net cash used in operating activities (5,962) (9,277)
Cash flows from investing activities:    
Purchase of property, plant and equipment (2) (39)
Net cash used in investing activities (2) (39)
Cash flows from financing activities:    
Net proceeds from the issuance of debt 3,719 0
Net proceeds from sale of common stock and warrants 0 4,210
Net proceeds from convertible debt financing 0 2,172
Net cash provided by financing activities 3,869 6,382
Foreign currency effects on cash, cash equivalents and restricted cash (69) (45)
Net decrease in cash, cash equivalents and restricted cash (2,164) (2,979)
Cash, cash equivalents and restricted cash:    
Beginning of period 3,578 5,324
End of period 1,414 2,345
Supplemental non-cash financing activities:    
Fair value of warrants issued 0 23,532
Series D Preferred Stock [Member]    
Cash flows from financing activities:    
Net proceeds from sale of Series D Preferred Stock $ 150 $ 0