Purchased Receivables - Summary of Components of Net Purchased Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Purchased Receivables [Abstract]
Purchased receivables	$ 13,607	$ 24,467
Reserve for purchased receivable losses	(87)	(94)
Total	$ 13,520	$ 24,373