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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Summary of Significant Accounting Policies [Abstract]    
Clinical Services Reimbursement $ 0.5nbs_ClinicalServicesReimbursement $ 0.7nbs_ClinicalServicesReimbursement