Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Notes Payable - Additional Information (Details)

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Financing Agreements - Notes Payable - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity, Primary Beneficiary          
Debt Instrument [Line Items]          
Financing receivable   $ 5,000,000.0   $ 5,000,000.0  
AM Capital Funding, LLC.          
Debt Instrument [Line Items]          
Financing receivable $ 5,000,000.0        
Unamortized discount   $ 1,300,000   $ 1,300,000  
Percentage of total expense recognized   26.80% 28.20% 26.50% 30.40%
AM Capital Funding, LLC. | Variable Interest Entity, Primary Beneficiary          
Debt Instrument [Line Items]          
Notes payable   $ 93,700,000   $ 93,700,000  
Interest payable   200,000   $ 200,000  
Debt instrument, aggregate interest rate (percentage)       5.26%  
Interest expense   $ 1,400,000 $ 1,400,000 $ 2,900,000 $ 2,800,000
AM Capital Funding, LLC. | Secured Senior Term Notes, Series 2018-1, Class B          
Debt Instrument [Line Items]          
Financing receivable $ 5,000,000.0        
AM Capital Funding, LLC. | Senior Subordinated Notes          
Debt Instrument [Line Items]          
Debt instrument, maturity date Dec. 15, 2023        
Weighted average effective interest rate (in percentage)   5.88% 5.88% 5.88% 5.88%
AM Capital Funding, LLC. | Senior Subordinated Notes | Secured Senior Term Notes, Series 2018-1, Class A          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 72,000,000.0 $ 72,000,000.0   $ 72,000,000.0  
Stated interest rate (in percentage) 4.98% 4.98%   4.98%  
AM Capital Funding, LLC. | Senior Subordinated Notes | Secured Senior Term Notes, Series 2018-1, Class B          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 28,000,000.0 $ 28,000,000.0   $ 28,000,000.0  
Stated interest rate (in percentage) 5.98% 5.98%   5.98%