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Summary of Significant Accounting Policies (Summary of Activity of Level 3 Inputs Measured on Recurring Basis)(Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Summary of Significant Accounting Policies [Abstract]  
Balance at December 31, 2011 $ 368
Change in fair value of Warrant liability 401
Balance at September 30, 2012 $ 769