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Basis of Presentation - Concentrations of Credit Risk (Details)
3 Months Ended
Jun. 30, 2013
Accounts Receivable [Member]
Customers
Dec. 31, 2013
Accounts Receivable [Member]
Customer One [Member]
Dec. 31, 2013
Accounts Receivable [Member]
Customer Two [Member]
Dec. 31, 2013
UNITED STATES
Cash and Cash Equivalents and Restricted Cash [Member]
Concentration Risk [Line Items]        
Number of customers 2      
Concentration risk, percentage   40.00% 16.00% 60.00%