Finance Receivables - Summary of Credit Quality Finance Receivable Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Recency delinquency
Financing Receivable, Past Due [Line Items]
Finance receivables	$ 5,159	$ 5,285
Recency delinquency | Current
Financing Receivable, Past Due [Line Items]
Finance receivables	3,518	5,016
Recency delinquency | Total delinquency
Financing Receivable, Past Due [Line Items]
Finance receivables	1,641	269
Recency delinquency | 30-59 days
Financing Receivable, Past Due [Line Items]
Finance receivables	290	152
Recency delinquency | 60-89 days
Financing Receivable, Past Due [Line Items]
Finance receivables	227	102
Recency delinquency | 90+ days
Financing Receivable, Past Due [Line Items]
Finance receivables	1,124	15
Contractual delinquency
Financing Receivable, Past Due [Line Items]
Finance receivables	5,159	5,285
Contractual delinquency | Current
Financing Receivable, Past Due [Line Items]
Finance receivables	3,399	4,993
Contractual delinquency | Total delinquency
Financing Receivable, Past Due [Line Items]
Finance receivables	1,760	292
Contractual delinquency | 30-59 days
Financing Receivable, Past Due [Line Items]
Finance receivables	302	171
Contractual delinquency | 60-89 days
Financing Receivable, Past Due [Line Items]
Finance receivables	285	104
Contractual delinquency | 90+ days
Financing Receivable, Past Due [Line Items]
Finance receivables	$ 1,173	$ 17