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Organization (Details) (Loans Receivable [Member], USD $)
 3 Months Ended
Mar. 31, 2015
Minimum [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Duration of financing products 3 months
Loans and Leases Receivable, Lending Capacity $ 5,000ondk_LoansandLeasesReceivableLendingCapacity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Duration of financing products 24 months
Loans and Leases Receivable, Lending Capacity $ 250,000ondk_LoansandLeasesReceivableLendingCapacity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember