Finance Receivables, Credit Quality Information and Allowance for Loan Losses - Finance receivables (net), current and non-current portion (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finance receivables, net
Finance receivables, net Current portion	$ 59,309	$ 79,692
Finance receivables, net Non-current portion	1,058	2,303
Finance receivables, net	$ 60,367	$ 81,995