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FAIR VALUE MEASUREMENTS (Details) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Level 1
    
ASSETS    
Cash equivalents   $ 19,894
Total assets   19,894
Level 2
    
ASSETS    
Cash equivalents 14,592  
Total assets 14,592  
Level 3
    
LIABILITIES    
Economic rights 1,070  
Warrants   51
Scottish Enterprise agreement 20 20
Other liabilities measured at fair value 20 71
Total liabilities 1,090 71
Total
    
ASSETS    
Cash equivalents   19,894
Total assets   19,894
LIABILITIES    
Economic rights 1,070  
Warrants   51
Scottish Enterprise agreement 20 20
Other liabilities measured at fair value 20 71
Total liabilities $ 1,090 $ 71