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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Lease term of contract 10 years 10 months
Initial monthly fixed rent payments $ 0.4ondk_OperatingLeasesAdditionalMonthlyRentExpense
Rent credits 3.6ondk_OperatingLeasesAggregateRentCredit
Tenant improvement allowance $ 5.8ondk_OperatingLeasesTenantImprovementAllowance