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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income (loss) $ 7,187 $ (11,332)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 7 21
Restricted stock compensation expense 14 27
Depreciation expense 120 74
Loss on disposal of equipment 0 20
Warrant liability fair value adjustment (14,697) (1,238)
Non-cash interest income (4) (2)
Debt discount and deferred finance costs amortization 0 8,363
Changes in assets and liabilities:    
Prepaid expenses and other assets 152 117
Accounts receivable (24) (94)
Inventories 24 (115)
Accounts payable and accrued expenses 828 401
Other non-current liabilities (50) (59)
Net cash used in operating activities (6,443) (3,817)
Cash flows from investing activities:    
Purchase of property, plant and equipment (6) (58)
Net cash used in investing activities (6) (58)
Cash flows from financing activities:    
Net proceeds from the release of restricted cash 238 6,091
Net proceeds from sale of stock 4,253 0
Net cash provided by financing activities 4,491 6,091
Foreign currency effects on cash and cash equivalents (12) (221)
Net (decrease) increase in cash and cash equivalents (1,970) 1,995
Cash and cash equivalents:    
Beginning of period 3,999 4,409
End of period 2,029 6,404
Supplemental non-cash activities:    
Conversion of convertible notes 0 12,210
Fair value of warrants issued 18,306 0
Fair value of warrants exercised $ 0 $ 0