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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (1,813) $ (3,488)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 95 102
Restricted stock compensation expense 138 22
Depreciation expense 87 196
Warrant liability fair value adjustment (1,672) (209)
Non-cash interest income (2) (1)
Changes in assets and liabilities:    
Decrease (increase) in prepaid expenses and other assets 86 (14)
Decrease (increase) in accounts receivable 84 (156)
(Increase) decrease in inventories (71) 65
Decrease in accounts payable and accrued expenses (696) (877)
Decrease in other non-current liabilities (53) (54)
Net cash used in operating activities (3,817) (4,414)
Cash flows from investing activities:    
Purchase of property, plant and equipment (15) (45)
Proceeds from sales of property, plant and equipment 0 0
Net cash used in investing activities (15) (45)
Cash flows from financing activities:    
Net proceeds from sale of stock and exercise of warrants 767 2,479
Net cash provided by financing activities 767 2,479
Foreign currency effects on cash and cash equivalents 3 (27)
Net decrease in cash and cash equivalents (3,062) (2,007)
Cash and cash equivalents:    
Beginning of period 12,607 20,469
End of period 9,545 18,462
Supplemental non-cash activities:    
Fair value of warrants issued 183 820
Fair value of warrants exercised $ 245 $ 0