Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and restricted cash	$ 33,169	$ 24,684
Equity investments with readily determinable fair values	3,013	0
Finance receivables	179,035	199,781
Repossessed assets:	856	1,340
Credit facility	109,000	126,830
Note payable	3,244	0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and restricted cash	33,169	24,684
Equity investments with readily determinable fair values	3,013	0
Finance receivables	179,035	199,781
Repossessed assets:	856	1,340
Credit facility	109,000	126,830
Note payable	3,244	0
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and restricted cash	33,169	24,684
Equity investments with readily determinable fair values	3,013	0
Finance receivables	0	0
Repossessed assets:	0	0
Credit facility	0	0
Note payable	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and restricted cash	0	0
Equity investments with readily determinable fair values	0	0
Finance receivables	0	0
Repossessed assets:	0	0
Credit facility	109,000	126,830
Note payable	3,244	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and restricted cash	0	0
Equity investments with readily determinable fair values	0	0
Finance receivables	179,035	199,781
Repossessed assets:	856	1,340
Credit facility	0	0
Note payable	$ 0	$ 0