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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Concentration Risk [Line Items]
Total revenue	$ 57,518	$ 54,135	$ 110,189	$ 106,356
Revenue earned over time
Concentration Risk [Line Items]
Total revenue	49,649	47,514	97,297	94,914
Revenue earned at a point in time
Concentration Risk [Line Items]
Total revenue	7,869	6,621	12,892	11,442
Software and related services revenue
Concentration Risk [Line Items]
Total revenue	40,677	37,679	76,359	74,283
Proprietary payments revenue
Concentration Risk [Line Items]
Total revenue	14,523	14,058	28,998	27,493
Other revenue
Concentration Risk [Line Items]
Total revenue	$ 2,318	$ 2,398	$ 4,832	$ 4,580

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