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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net loss $ (5,278) $ (12,845)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 178 467
Restricted stock compensation expense 42 197
Depreciation expense 249 298
Warrant liability fair value adjustment 205 2,272
Loss on write-downs and disposal of equipment 82 0
Non-cash interest income 0 (2)
Changes in assets and liabilities:    
Decrease (increase) in prepaid expenses and other current assets 419 (248)
Decrease in accounts receivable 169 85
Decrease (increase) in inventories 99 (97)
Decrease in accounts payable and accrued expenses (512) (764)
Decrease in other non-current liabilities (140) (300)
Net cash used in operating activities (4,487) (10,937)
Cash flows from investing activities:    
Purchase of property, plant, and equipment 0 (34)
Net cash used in by investing activities 0 (34)
Cash flows from financing activities:    
Net proceeds from sale of stock and exercise of stock options and warrants 4,495 30,018
Net cash provided by financing activities 4,495 30,018
Foreign currency effects on cash (3) 31
Net increase in cash and cash equivalents 5 19,078
Cash and cash equivalents:    
Beginning of period 31,249 23,726
End of period 31,254 42,804
Supplemental non-cash activities:    
Fair value of warrants exercised $ 116 $ 214