FINANCE RECEIVABLES - Information Regarding Finance Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016
Receivables [Abstract]
Finance receivables, net	$ 6,260	$ 4,603	$ 2,234	$ 3,296	$ 1,441	$ 9,743	$ 2,149	$ 1,442	$ 3,349
Finance receivables due after one year, net	11,596	13,246	$ 9,870	$ 11,728	$ 7,742	$ 8,607	$ 7,548	$ 3,956	$ 3,962
Total finance receivables	17,856	17,849
Finance receivables, allowance	$ 606	$ 12