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Derivative Financial Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair value measurements                
Derivative liabilities related to Warrants $ 130     $ 1,534        
Derivative instrument liability | Warrants
               
Fair value measurements                
Derivative liabilities related to Warrants 130 555 1,311 1,534 1,050 973 6,351 5,258
Fair value on a recurring basis | Significant Unobservable Inputs (Level 3) | Derivative instrument liability | Warrants
               
Fair value measurements                
Derivative liabilities related to Warrants       1,534        
Fair value on a recurring basis | Total Fair Value | Derivative instrument liability | Warrants
               
Fair value measurements                
Derivative liabilities related to Warrants       $ 1,534