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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
segment
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Sep. 30, 2015
Jun. 30, 2015
Noncontrolling Interest [Line Items]          
Number of operating segments | segment 1        
Number of reportable segments | segment 1        
Lines of credit amortization period 6 months        
Threshold to consider a loan to be delinquent 1 day        
Delinquency threshold to make initial assessment of charge off 90 days        
Accretion of dividends on redeemable convertible preferred stock $ 0 $ 0 $ 12,884,000    
Preferred stock or other warrants issued (in shares) | shares 0 0      
Advertising costs $ 20,100,000 $ 22,500,000 $ 14,400,000    
Cumulative translation loss (7,000) (372,000)      
Gain (loss) resulting from foreign exchange transactions 200,000 (1,300,000)      
Income tax, penalties and interest accrued $ 0 0      
Stock options          
Noncontrolling Interest [Line Items]          
Additional monthly vesting period 3 years        
Expiration period 10 years        
Period after employee's termination 90 days        
Stock options | Tranche one          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
Vesting period 1 year        
Stock options | Tranche two          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
Stock options | Tranche three          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
Stock options | Tranche four          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs          
Noncontrolling Interest [Line Items]          
Vesting period 4 years        
RSUs | Tranche one          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs | Tranche two          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs | Tranche three          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs | Tranche four          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
On Deck Australia          
Noncontrolling Interest [Line Items]          
Ownership percentage         55.00%
Ownership percentage by non-affiliated parties         45.00%
Lancelot QBFOD LLC          
Noncontrolling Interest [Line Items]          
Ownership percentage       67.00%  
Ownership percentage by non-affiliated parties       33.00%  
Accounting Standards Update 2015-03 | Other Noncurrent Assets          
Noncontrolling Interest [Line Items]          
Deferred debt issuance costs   (4,200,000)      
Accounting Standards Update 2015-03 | Long-term Debt          
Noncontrolling Interest [Line Items]          
Deferred debt issuance costs   (4,200,000)      
Redeemable Convertible Preferred Stock          
Noncontrolling Interest [Line Items]          
Accretion of dividends on redeemable convertible preferred stock $ 0 $ 0      
Redeemable convertible preferred stock outstanding (in shares) | shares 0 0