ACCRUED EXPENSES - Information Regarding Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Accrued Liabilities [Abstract]
Accrued sales tax	$ 20,036	$ 16,559
Accrued compensation and related sales commissions	2,757	2,139
Operating lease liabilities - current	1,075
Accrued professional fees	924	2,872
Income taxes payable	123	254
Accrued other taxes and filing fees	220	209
Accrued other, including settlement of shareholder class action lawsuit	5,130	1,672
Total accrued expenses	$ 30,265	$ 23,705