Quarterly report pursuant to Section 13 or 15(d)

Finance Receivables - Original Product - Schedule of Finance Receivables for Original Product (Detail)

v3.20.2
Finance Receivables - Original Product - Schedule of Finance Receivables for Original Product (Detail) - Original Product [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Unit
Dec. 31, 2019
USD ($)
Unit
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding $ 312,000 $ 386,000
Reserve for credit losses (142,000) (112,000)
Finance receivables, net $ 170,000 $ 274,000
Number of active units with delinquent assessments | Unit 489 598
Amount of outstanding interest and late fees on active units $ 8,682,000 $ 9,167,000
Funded During The Current Year [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 16,000 40,000
1-2 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 14,000 15,000
2-3 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 9,000 20,000
3-4 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 17,000 11,000
Greater Than 4 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding $ 256,000 $ 300,000