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Summary of Significant Accounting Policies - Tax Receivable Agreement (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2019
Tax Receivable Agreement Payments [Line Items]    
Percent of tax benefits realized that the company must make payments to holders for   85.00%
Percent of remaining tax benefits the Company expects to benefit from   15.00%
LIBOR    
Tax Receivable Agreement Payments [Line Items]    
Accrued interest rate on late payments   100.00%
Accrued interest rate on late payments 500.00%