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v3.20.1

Organization - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 19, 2020 | Dec. 31, 2019
Organization And Basis Of Presentation [Line Items] |  |
Notes payable to affiliates |  | $ 5,700,000
Notes payable maturity |  | 2020
CDS [Member] | Subsequent Events [Member] | Revolving Capital Line of Credit Agreement [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Debt instrument, term | 5 years |
CDS [Member] | Subsequent Events [Member] | Revolving Capital Line of Credit Agreement [Member] | Secured Financing [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Capital line of credit | $ 10,000,000 |
Debt instrument, term | 5 years |
Master Transfer Agreement | CDS [Member] | Class A [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Membership interests transferred in exchange for estimated residual cash flows period |  | 3 years

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