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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended
Dec. 31, 2018
USD ($)
segment
institution
patent
$ / shares
Dec. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number of financial institutions signed agreements to deploy mobile deposit (more than) | institution 6,100    
Number of patents granted | patent 49    
Number of pending patent applications | patent 21    
Net (loss) gain resulting from exchange translation $ (824,000) $ 189,000  
Other-than-temporary impairment charges recognized 0 0  
Write-offs of allowance for doubtful accounts 0 0  
Allowance for doubtful accounts receivable 400,000   $ 300,000
Capitalized software development costs 0 0  
Amortization expense of capitalized software development costs 0 0  
Capitalized software development costs for internal use 49,000 54,000  
Amortization expense from capitalized software development costs $ 81,000 $ 0  
Number of operating segments | segment 1    
Number of reporting units | segment 1    
Goodwill impairment $ 0    
Common stock, par value (in dollars per share) | $ / shares $ 0.001   $ 0.001
Trading-day average stock price period 20 days    
Accumulated other comprehensive loss $ 1,397,000   $ 586,000
Minimum | ICAR | Spanish Government Agencies      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Term of loan agreement 5 years    
Amount outstanding under loan agreement $ 600,000   800,000
Minimum | ICAR | Spanish Government Agencies | Other current liabilities      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Amount outstanding under loan agreement 200,000   300,000
Minimum | ICAR | Spanish Government Agencies | Other non-current liabilities      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Amount outstanding under loan agreement $ 400,000   $ 500,000
Maximum | ICAR | Spanish Government Agencies      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Term of loan agreement 12 years    
Interest rate on loan agreement 0.00%