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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net loss $ (9,485) $ (9,611)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 138 255
Restricted stock compensation expense 228 189
Depreciation expense 232 504
Loss on disposal of equipment 1 2
Warrant liability fair value adjustment (9,171) (1,414)
Non-cash interest income (1) (1)
Deferred revenue 31 0
Debt discount and deferred finance costs amortization 6,567 0
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 610 306
Increase in accounts receivable (94) (135)
Decrease (increase) in inventories 190 (62)
Increase (decrease) in accounts payable and accrued expenses 312 (2,056)
Decrease in other non-current liabilities (155) (165)
Net cash used in operating activities (10,597) (12,188)
Cash flows from investing activities:    
Purchase of property, plant and equipment (245) (129)
Increase in restricted cash (1,087) 0
Proceeds from sales of property, plant and equipment 0 2
Net cash used in investing activities (1,332) (127)
Cash flows from financing activities:    
Increase in restricted cash (29,200) 0
Net proceeds from convertible debt financing 31,436 0
Net proceeds from sale of stock and exercise of warrants 704 8,674
Net cash provided by financing activities 2,940 8,674
Foreign currency effects on cash and cash equivalents 71 (162)
Net decrease in cash and cash equivalents (8,918) (3,803)
Cash and cash equivalents:    
Beginning of period 12,607 20,469
End of period 3,689 16,666
Supplemental non-cash activities:    
Fair value of warrants issued 28,133 4,247
Fair value of warrants exercised $ 245 $ 123