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Fair Value (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Economic Rights
Reconciliation of the beginning and ending balance of Level 3 inputs      
Balance at the beginning of the period $ 20 $ 1,140  
Change in valuation of liability     (570)
Movement of valuation of liability from Level 3 to Level 2     (550)
Balance at the end of the period $ 20 $ 1,140