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Derivative Financial Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified
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 $ 1,311 $ 1,534        
Derivative instrument liability | Warrants
           
Fair value measurements            
Derivative liabilities related to Warrants 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 1,311 1,534        
Fair value on a recurring basis | Total Fair Value | Derivative instrument liability | Warrants
           
Fair value measurements            
Derivative liabilities related to Warrants $ 1,311 $ 1,534