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Significant Accounting Policies - Summary of Assets Under Management Subject to Fees (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets under management (AUM) subject to incentive fees and the incentive fees      
Total AUM Subject to Incentive Fees $ 470,726,000 $ 274,302,549 $ 170,432,450
Calendar Quarter-End
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Total AUM Subject to Incentive Fees 0 0 89,070,421
Calendar Year-End
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Total AUM Subject to Incentive Fees 0 0 81,362,029
Quarter Ended June 30, 2017
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Total AUM Subject to Incentive Fees 380,073,000 274,302,549 0
Quarter Ended December 31, 2018
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Total AUM Subject to Incentive Fees 90,653,000 0 0
Incentive Fees Under Method One
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 0 3,301 2,597
Incentive Fees Under Method One | Calendar Quarter-End
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 0 0 507
Incentive Fees Under Method One | Calendar Year-End
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 0 0 2,090
Incentive Fees Under Method One | Quarter Ended June 30, 2017
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 0 3,301 0
Incentive Fees Under Method One | Quarter Ended December 31, 2018
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 0 0 0
Incentive Fees Under Method Two
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 3,900,649 361,700 2,597
Incentive Fees Under Method Two | Calendar Quarter-End
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 0 0 507
Incentive Fees Under Method Two | Calendar Year-End
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 0 0 2,090
Incentive Fees Under Method Two | Quarter Ended June 30, 2017
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees 3,900,649 361,700 0
Incentive Fees Under Method Two | Quarter Ended December 31, 2018
      
Assets under management (AUM) subject to incentive fees and the incentive fees      
Performance Incentive Fees $ 0 $ 0 $ 0