NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) institution $ / shares	Sep. 30, 2024 USD ($) segment institution reportingUnit $ / shares	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($)	Dec. 31, 2017
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of financial services organizations, leading marketplace and financial technology brands (more than) | institution	7,900	7,900
Cumulative earnings deficit	$ 2,800,000	$ 2,800,000	$ 15,100,000
Foreign currency translation adjustment		11,634,000	13,093,000	$ (27,559,000)
Foreign currency transaction adjustment		1,000,000	(700,000)	(800,000)
Unbilled receivables	400,000	400,000	900,000
Restructuring costs		1,762,000	2,114,000	1,800,000
Write-offs of allowance for doubtful accounts		200,000	100,000	0
Allowance for doubtful accounts receivable	2,100,000	2,100,000	1,500,000	900,000
Additions to the allowance for credit loss		700,000	700,000	500,000
Depreciation and amortization of property and equipment		1,755,000	1,727,000	1,401,000
Repairs and maintenance expenses		100,000	100,000	100,000
Impairment or long-lived assets		0	0	0
Capitalized software development costs	0	0	0	0
Amortization expense for capitalized software development costs		0	0	0
Capitalized software development costs for internal use	700,000	700,000	700,000	800,000
Amortization expense for capitalized software development costs for internal use		$ 900,000	700,000	400,000
Number of reporting units | reportingUnit		1
Goodwill impairment	$ 0	$ 0
Impairment to intangible assets		$ 0	$ 0	0
Number of operating segments | segment		1
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001
Trading-day average stock price period		20 days
Advertising costs		$ 1,400,000	$ 1,200,000	1,100,000
Revenue		172,083,000	172,552,000	144,804,000
Operating expenses		(169,852,000)	(156,988,000)	(132,604,000)
Operating income		2,231,000	15,564,000	$ 12,200,000
Total Adjustments
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Revenue		1,400,000
Operating expenses		500,000
Operating income		$ 1,900,000
Spanish Government Agencies | ICAR Vision Systems, S.L.
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Interest rate on loan agreements	0.00%	0.00%			0.00%
Total amounts outstanding under loan agreements	$ 2,700,000	$ 2,700,000	1,200,000
Spanish Government Agencies | Other Current Liabilities | ICAR Vision Systems, S.L.
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Current loans payable	300,000	300,000	200,000
Spanish Government Agencies | Other Noncurrent Liabilities | ICAR Vision Systems, S.L.
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Noncurrent loans payable	$ 2,400,000	$ 2,400,000	$ 1,100,000
Minimum
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years	3 years
Minimum | Spanish Government Agencies | ICAR Vision Systems, S.L.
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Repayment period of loan agreements		5 years			5 years
Maximum
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	7 years	7 years
Maximum | Spanish Government Agencies | ICAR Vision Systems, S.L.
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Repayment period of loan agreements		12 years			12 years