REVISION OF PREVIOUSLY REPORTED CONSOLIDATED FINANCIAL STATEMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liabilities (deferred revenue), current	$ 17,360				$ 21,350				$ 17,360	$ 21,350
Accounts receivable, net	32,132				35,922				32,132	35,922
Net operating loss carryforwards	11,548				6,656				11,548	6,656
Impacts of foreign exchange									4,600
Revenue	37,656	$ 43,070	$ 46,123	$ 45,703	39,626	$ 39,195	$ 33,510	$ 32,473	172,552	144,804	$ 119,797
Contract assets, current portion	18,355				7,037				18,355	7,037
Income tax benefit (provision)	(2,123)	$ 783	$ 1,808	$ 1,846	976	$ (880)	$ (20)	$ (168)	2,314	(92)	$ 824
Prepaid expenses	(3,513)				(1,946)				(3,513)	(1,946)
Deferred income tax assets	(11,645)				(10,110)				(11,645)	(10,110)
Income tax payables	4,329				206				4,329	206
Other current liabilities	$ (1,482)				(2,402)				$ (1,482)	(2,402)
Total Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liabilities (deferred revenue), current					7,956					7,956
Accounts receivable, net					8,048					8,048
Net operating loss carryforwards					21,600					21,600
Net operating loss carryforwards					5,400					5,400
Revenue										861
Contract assets, current portion					764					764
Income tax benefit (provision)										203
Prepaid expenses					54					54
Deferred income tax assets					135					135
Income tax payables					12					12
Other current liabilities					7					7
Adjustment 1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liabilities (deferred revenue), current					8,000					8,000
Adjustment 2
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liabilities (deferred revenue), current					$ 200					$ 200