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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details)
$ / shares in Units, check_deposit in Billions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
patent
institution
check_deposit
$ / shares
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
segment
patent
institution
check_deposit
$ / shares
Mar. 31, 2020
USD ($)
Feb. 05, 2021
USD ($)
Sep. 30, 2020
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 7,500     7,500      
Number of check deposits processed (over five billion) | check_deposit 5     5      
Number of patents granted | patent 71     71      
Number of pending patent applications | patent 17     17      
(Loss) gain resulting from foreign exchange translation $ (2,648,000)   $ (1,064,000) $ 112,000 $ 189,000    
Product management costs 6,691,000   5,581,000 [1] 12,855,000 10,873,000 [1]    
Other than temporary impairment charges recognized on investments 0   0 0 0    
Write-offs of allowance for doubtful accounts       34,000 0    
Allowance for doubtful accounts receivable 200,000     200,000     $ 200,000
Capitalized software development costs 0   0 0 0    
Amortization expense of capitalized software development costs $ 0   0 0 0    
Capitalized software development costs for internal use       400,000 100,000    
Amortization expense from capitalized software development costs for internal use       $ 200,000 200,000    
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     $ 0.001
Impairment charges related to intangible assets $ 0   0 $ 0 0    
Trading-day average stock price period       20 days      
Accumulated other comprehensive loss $ 397,000     $ 397,000     $ 323,000
Convertible Debt | 2026 Notes              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Debt issued           $ 155,300,000  
Debt interest rate           0.75%  
Revision of Prior Period, Reclassification, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Product management costs     $ 800,000   $ 1,400,000    
ICAR | Spanish Government Agencies              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Debt interest rate 0.00%     0.00%      
Amount outstanding under loan agreement $ 900,000     $ 900,000     700,000
ICAR | Spanish Government Agencies | Other current liabilities              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Amount outstanding under loan agreement 100,000     100,000     100,000
ICAR | Spanish Government Agencies | Other non-current liabilities              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Amount outstanding under loan agreement $ 800,000     $ 800,000     $ 600,000
Minimum | ICAR | Spanish Government Agencies              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Term of loan agreement       5 years      
Maximum | ICAR | Spanish Government Agencies              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Term of loan agreement       12 years      
[1] March 31, 2020 consolidated statements of operations reflect reclassifications to conform to the current year presentation.