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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended
Dec. 31, 2021
USD ($)
segment
institution
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Feb. 05, 2021
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of financial services organizations, leading marketplace and financial technology brands (more than) | institution 7,500      
Net (loss) gain resulting from foreign exchange translation $ (1,267,000)   $ 2,760,000  
Other than temporary impairment charges recognized on investments $ 0   0  
Common stock, par value (in dollars per share) | $ / shares $ 0.001 $ 0.001    
Write-offs of allowance for doubtful accounts $ 1,000      
Allowance for doubtful accounts receivable 500,000 $ 400,000    
Capitalized software development costs for internal use 200,000   200,000  
Amortization expense from capitalized software development costs for internal use $ 15,000   100,000  
Number of operating segments | segment 1      
Number of reporting units | segment 1      
Goodwill impairment   0    
Impairment charges related to intangible assets $ 0   $ 0  
Trading-day average stock price period 20 days      
Accumulated other comprehensive loss $ 2,480,000 943,000    
Convertible Debt | 2026 Notes        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt issued       $ 155,300,000
Debt interest rate       0.75%
ICAR | Spanish Government Agencies        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt interest rate 0.00%      
Amount outstanding under loan agreement $ 800,000 800,000    
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    
ICAR | Spanish Government Agencies | Other non-current liabilities        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Amount outstanding under loan agreement $ 700,000 $ 700,000    
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