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Fair Value (Details) (Recurring basis, USD $)
Dec. 31, 2012
Dec. 31, 2011
Level 1
    
ASSETS    
Cash equivalents $ 5,523,000 $ 19,894,000
Total assets 5,523,000 19,894,000
Level 2
    
ASSETS    
Cash equivalents 6,799,000  
Total assets 6,799,000  
Level 3
    
LIABILITIES    
Economic rights 1,120,000  
Warrants Liability   51,000
Scottish Enterprise agreement 20,000 20,000
Other liabilities measured at fair value 20,000 71,000
Total liabilities 1,140,000 71,000
Total
    
ASSETS    
Cash equivalents 12,322,000 19,894,000
Financial instrument associated with stock purchase agreement 0  
Total assets 12,322,000 19,894,000
LIABILITIES    
Economic rights 1,120,000  
Warrants Liability   51,000
Scottish Enterprise agreement 20,000 20,000
Other liabilities measured at fair value 20,000 71,000
Total liabilities $ 1,140,000 $ 71,000