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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net (loss) income $ (7,893) $ 7,187
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 54 7
Restricted stock compensation expense 4 14
Depreciation expense 65 120
Warrant liability fair value adjustment (7) (14,697)
Non-cash interest income 0 (4)
Interest expense accrued related to convertible notes 51 0
Debt discount amortization 2,160 0
Changes in assets and liabilities:    
Prepaid expenses and other assets (108) 152
Accounts receivable 523 (24)
Inventories 61 24
Accounts payable and accrued expenses 2,902 828
Deferred revenue (120) 0
Other non-current liabilities (462) (50)
Net cash used in operating activities (2,770) (6,443)
Cash flows from investing activities:    
Purchase of property, plant and equipment (2) (6)
Net cash used in investing activities (2) (6)
Cash flows from financing activities:    
Net proceeds from the issuance of debt 400 0
Net proceeds from sale of common stock and warrants 0 4,253
Net cash provided by financing activities 550 4,253
Foreign currency effects on cash, cash equivalents and restricted cash (30) (12)
Net decrease in cash, cash equivalents and restricted cash (2,252) (2,208)
Cash, cash equivalents and restricted cash:    
Beginning of period 3,578 5,324
End of period 1,326 3,116
Supplemental non-cash financing activities:    
Fair value of warrants issued 0 18,306
Series D Preferred Stock [Member]    
Cash flows from financing activities:    
Net proceeds from sale of Series D Preferred Stock $ 150 $ 0