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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
Sep. 30, 2023
USD ($)
institution
segment
reportingUnit
$ / shares
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2021
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      
Foreign currency translation adjustment $ 13,093,000 $ (27,559,000) $ (455,000)  
Unbilled receivables 900,000 1,700,000    
Restructuring costs 2,114,000 1,800,000 0  
Other-than-temporary impairment charges recognized in earnings 0 0 0  
Write-offs of allowance for doubtful accounts 100,000 0 100,000  
Allowance for doubtful accounts receivable 1,500,000 900,000    
Depreciation and amortization of property and equipment 1,727,000 1,401,000 1,439,000  
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  
Amortization expense for capitalized software development costs 0 0 0  
Capitalized software development costs for internal use 700,000 800,000 800,000  
Amortization expense for capitalized software development costs for internal use $ 700,000 400,000 300,000  
Number of operating segments | segment 1      
Number of reporting units | reportingUnit 1      
Goodwill impairment $ 0      
Impairment to intangible assets $ 0 $ 0 0  
Trading-day average stock price period 20 days      
Common stock, par value (in dollars per share) | $ / shares $ 0.001 $ 0.001    
Advertising costs $ 1,200,000 $ 1,100,000 $ 1,200,000  
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%
Total amounts outstanding under loan agreements 1,200,000 1,300,000    
Spanish Government Agencies | Other Current Liabilities | ICAR Vision Systems, S.L.        
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]        
Current amount outstanding under loan agreements 200,000 100,000    
Spanish Government Agencies | Other Noncurrent Liabilities | ICAR Vision Systems, S.L.        
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]        
Non-current amount outstanding under loan agreements $ 1,100,000 $ 1,200,000    
Minimum        
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]        
Property and equipment, estimated useful lives 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
Maximum        
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]        
Property and equipment, estimated useful lives   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