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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended
Sep. 30, 2014
Institution
Sep. 30, 2013
Sep. 30, 2012
Nov. 28, 2014
Subsequent Event [Member]
Patents
Sep. 30, 2014
Assets acquired under capital leases [Member]
Sep. 30, 2013
Assets acquired under capital leases [Member]
Sep. 30, 2012
Assets acquired under capital leases [Member]
Sep. 30, 2014
Software and Software Development Costs [Member]
Sep. 30, 2013
Software and Software Development Costs [Member]
Sep. 30, 2012
Software and Software Development Costs [Member]
Sep. 30, 2014
Maximum [Member]
Sep. 30, 2014
Minimum [Member]
Property, Plant and Equipment [Line Items]                        
Number of patents granted       20                
Number of patent applications pending       23                
Number of financial institutions signed agreements to deploy Mobile Deposit 3,026                      
Number of companies deployed Mobile Deposit 2,521                      
Number of U.S. retail banks and payment processing companies 50                      
Short term investments maturity period Three months or less                      
Investments maturity or sale is expected 1 year                      
Allowance for doubtful accounts $ 0 $ 0                    
Deferred software maintenance fees amortization period 1 year                      
Property and equipment, estimated useful lives                     5 3
Depreciation and amortization of property and equipment total 470,697 323,383 140,146                  
Fixed assets acquired under capital leases 2,385,390 2,257,895     95,388 95,388            
Depreciation expense under capital lease         19,078 19,078 17,488          
Accumulated depreciation 1,092,120 628,231     55,644 36,566            
Total repairs and maintenance expenses 115,792 97,532 57,815                  
Impairment charges 0 0 0                  
Software development costs capitalized 0 0                    
Amortization of software development costs               0 0 91,438    
Tax benefit is measured based on the largest benefit Greater than 50%                      
Advertising costs 99,670 123,905 72,053                  
Accumulated other comprehensive gain (loss) $ (7,810) $ 1,838