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Basis of Presentation - Concentrations of Credit Risk (Details) - Customer
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Accounts Receivable | Customer Concentration Risk    
Concentration Risk [Line Items]    
Concentration risk, percentage 10.00%  
Number of customers 0 0
UNITED STATES | Cash and Cash Equivalents and Restricted Cash    
Concentration Risk [Line Items]    
Concentration risk, percentage 80.00%