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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net loss $ (11,332) $ (1,813)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 21 95
Restricted stock compensation expense 27 138
Depreciation expense 74 87
Loss on disposal of equipment 20 0
Warrant liability fair value adjustment (1,238) (1,672)
Non-cash interest income (2) (2)
Deferred revenue 0 0
Debt discount and deferred finance costs amortization 8,363 0
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 117 86
Decrease (increase) in accounts receivable (94) 84
Increase in inventories (115) (71)
Increase (decrease) in accounts payable and accrued expenses 401 (696)
Decrease in other non-current liabilities (59) (53)
Net cash used in operating activities (3,817) (3,817)
Cash flows from investing activities:    
Purchase of property, plant and equipment (58) (15)
Net cash used in investing activities (58) (15)
Cash flows from financing activities:    
Net proceeds from the release of restricted cash 6,091 0
Net proceeds from sale of stock and exercise of warrants 0 767
Net cash provided by financing activities 6,091 767
Foreign currency effects on cash and cash equivalents (221) 3
Net increase (decrease) in cash and cash equivalents 1,995 (3,062)
Cash and cash equivalents:    
Beginning of period 4,409 12,607
End of period 6,404 9,545
Supplemental non-cash activities:    
Conversion of convertible notes 12,210 0
Fair value of warrants issued 0 183
Fair value of warrants exercised $ 0 $ 245