Purchased Receivables - Allowance on Net Purchase Receivables (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance at beginning of period	$ 200,000	$ 171,000
Charge-offs	(1,104,000)	(279,000)
Balance at end of period	209,000	183,000
Purchased Receivable
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Charge-offs net of recoveries	0	0
Reserve for purchased receivables	$ 9,000	$ 12,000