SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Rollforward Of Allowance For Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Accounts Receivable
Beginning balance	$ 6,926	$ 6,614	$ 7,313	$ 7,676
Provision for expected losses	801	312	542	394
Write-offs	(566)		0
Ending balance	7,161	6,926	7,855	7,313
Finance Receivable
Beginning balance	1,209	1,109	559	150
Provision for expected losses	100	100	350	0
Write-offs	(247)		0
Ending balance	$ 1,062	1,209	$ 909	559
Impact of adoption of ASC 326
Accounts Receivable
Beginning balance		0		(757)
Finance Receivable
Beginning balance		$ 0		$ 409