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Fair Value (Details) (Recurring basis, USD $)
Dec. 31, 2013
Dec. 31, 2012
Level 1
    
ASSETS    
Cash equivalents $ 26,476,000 $ 5,523,000
Financial instrument associated with stock purchase agreement      
Total assets 26,476,000 5,523,000
Other liabilities measured at fair value:    
Warrants Liability      
Scottish Enterprise agreement      
Other liabilities measured at fair value      
Total liabilities      
Level 2
    
ASSETS    
Cash equivalents   6,799,000
Financial instrument associated with stock purchase agreement 397,000   
Total assets 397,000 6,799,000
Other liabilities measured at fair value:    
Warrants Liability     
Scottish Enterprise agreement     
Other liabilities measured at fair value     
Total liabilities     
Level 3
    
ASSETS    
Cash equivalents      
Financial instrument associated with stock purchase agreement      
Total assets      
LIABILITIES    
Economic rights   1,120,000
Other liabilities measured at fair value:    
Warrants Liability      
Scottish Enterprise agreement 20,000 20,000
Other liabilities measured at fair value 20,000 20,000
Total liabilities 20,000 1,140,000
Total
    
ASSETS    
Cash equivalents 26,476,000 12,322,000
Financial instrument associated with stock purchase agreement 397,000   
Total assets 26,873,000 12,322,000
LIABILITIES    
Economic rights   1,120,000
Other liabilities measured at fair value:    
Warrants Liability      
Scottish Enterprise agreement 20,000 20,000
Other liabilities measured at fair value 20,000 20,000
Total liabilities $ 20,000 $ 1,140,000