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REVENUE CONCENTRATION - 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
Concentration Risk [Line Items]
Revenue	$ 37,656	$ 43,070	$ 46,123	$ 45,703	$ 39,626	$ 39,195	$ 33,510	$ 32,473	$ 172,552	$ 144,804	$ 119,797
Accounts receivable, net	32,132				35,922				32,132	35,922
All other countries
Concentration Risk [Line Items]
Revenue									37,595	31,305	26,965
Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Revenue									$ 27,700	$ 25,000	$ 20,200
Revenue | Customer Concentration Risk | Customer One
Concentration Risk [Line Items]
Concentration risk (as a percent)									16.00%	17.00%	17.00%
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net	$ 2,700				$ 8,000				$ 2,700	$ 8,000	$ 3,400
Long-Term Assets | Geographic Concentration Risk | All other countries
Concentration Risk [Line Items]
Concentration risk (as a percent)									72.00%	68.00%
Long-Term Assets, Excluding Goodwill and Intangible Assets | Geographic Concentration Risk | All other countries
Concentration Risk [Line Items]
Concentration risk (as a percent)									23.00%	18.00%

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