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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net loss $ (14,436) $ (25,533)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 321 407
Restricted stock compensation expense 96 179
Depreciation expense 742 866
Provision for inventory obsolescence 118 17
Warrant liability fair value adjustment (1,612) (2,345)
Loss on write-downs and disposals of equipment 147 5
Non-cash interest income 0 (1)
Changes in assets and liabilities:    
Decrease in prepaid expenses and other current assets 937 305
Decrease in accounts receivable 187 36
Decrease in inventories 73 133
Increase (decrease) in accounts payable and accrued expenses 275 (3,149)
Increase in other non-current liabilities 723 189
Net cash used in operating activities (12,429) (28,891)
Cash flows from investing activities:    
Purchase of property, plant and equipment 0 (113)
Proceeds from sales of property, plant and equipment 37 0
Net cash provided by (used in) investing activities 37 (113)
Cash flows from financing activities:    
Net proceeds from sale of stock and exercise of warrants 4,489 32,218
Net cash provided by financing activities 4,489 32,218
Foreign currency effects on cash (23) 795
Net (decrease) increase in cash and cash equivalents (7,926) 4,009
Cash and cash equivalents:    
Beginning of period 31,249 23,726
End of period 23,323 27,735
Supplemental non-cash activities:    
Fair value of warrants exercised $ 143 $ 219