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Fair Value Measurements (Reconciliation of Level 3 Assets and Liabilities) (Details) (Warrants Settleable In Cash [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Warrants Settleable In Cash [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance $ 267 $ 368
Change in fair value of Warrant liability $ (101)