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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (9,611) $ (14,436)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 255 321
Restricted stock compensation expense 189 96
Depreciation expense 504 742
Provision for inventory obsolescence   118
Loss on disposal of equipment 2 147
Warrant liability fair value adjustment (1,414) (1,612)
Non-cash interest income (1) 0
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 306 937
Decrease (increase) in accounts receivable (135) 187
Decrease (increase) in inventories (62) 73
Increase (decrease) in accounts payable and accrued expenses (2,056) 275
Increase (decrease) in other non-current liabilities (165) 723
Net cash used in operating activities (12,188) (12,429)
Cash flows from investing activities:    
Purchase of property, plant and equipment (129)  
Proceeds from sales of property, plant and equipment 2 37
Net cash (used in) provided by investing activities (127) 37
Cash flows from financing activities:    
Net proceeds from sale of stock and exercise of warrants 8,674 4,489
Net cash provided by financing activities 8,674 4,489
Foreign currency effects on cash and cash equivalents (162) (23)
Net decrease in cash and cash equivalents (3,803) (7,926)
Cash and cash equivalents:    
Beginning of period 20,469 31,249
End of period 16,666 23,323
Supplemental non-cash activities:    
Fair value of warrants issued 4,247  
Fair value of warrants exercised $ 123 $ 143