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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of Significant Accounting Policies [Abstract]        
Clinical Services Reimbursement $ 0.4 $ 0.8 $ 0.8 $ 2.0