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Summary of Significant Accounting Policies - Additional Information (Details 2)
 12 Months Ended 15 Months Ended 21 Months Ended
Dec. 31, 2014
Dec. 31, 2014
segment
Oct. 01, 2013
segment
Description of Business      
Number or reportable segments   1us-gaap_NumberOfReportableSegments 2us-gaap_NumberOfReportableSegments
Fiscal Calendar      
Fiscal quarter, number of weeks 91 days    
Cash and Cash Equivalents      
Maturity period of highly liquid investments 3 months