LOANS RECEIVABLE AND REVENUE - Loans Receivable by Product, Credit Services Organization (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current loans receivable Guaranteed by the Company	$ 34,830		$ 37,871
Delinquent loans receivable Guaranteed by the Company	8,592		6,234
Total loans receivable Guaranteed by the Company	43,422		44,105
Less: Liability for losses on CSO lender-owned consumer loans	(7,007)		(7,228)
Loans receivable Guaranteed by the Company, net	36,415		36,877
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Liability for losses on CSO lender-owned consumer loans	(7,007)	$ (5,265)	(7,228)	$ (6,198)	$ (5,164)	$ (10,623)
Consumer Portfolio Segment | Unsecured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current loans receivable Guaranteed by the Company	34,090		37,096
Delinquent loans receivable Guaranteed by the Company	8,385		6,079
Total loans receivable Guaranteed by the Company	42,475		43,175
Less: Liability for losses on CSO lender-owned consumer loans	(6,973)	(5,234)	(7,160)	(6,130)	(5,128)	(10,553)
Loans receivable Guaranteed by the Company, net	35,502		36,015
Consumer Portfolio Segment | Secured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current loans receivable Guaranteed by the Company	740		775
Delinquent loans receivable Guaranteed by the Company	207		155
Total loans receivable Guaranteed by the Company	947		930
Less: Liability for losses on CSO lender-owned consumer loans	(34)	$ (31)	(68)	$ (68)	$ (36)	$ (70)
Loans receivable Guaranteed by the Company, net	$ 913		$ 862