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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2013
Institution
Companies
Sep. 30, 2012
Sep. 30, 2011
Nov. 21, 2013
Subsequent Event [Member]
Patents
Sep. 30, 2013
Maximum [Member]
Sep. 30, 2013
Minimum [Member]
Sep. 30, 2013
Assets held under capital leases [Member]
Sep. 30, 2012
Assets held under capital leases [Member]
Sep. 30, 2011
Assets held under capital leases [Member]
Sep. 30, 2013
Software and Software Development Costs [Member]
Sep. 30, 2012
Software and Software Development Costs [Member]
Sep. 30, 2011
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]                        
Number of patents granted       18                
Number of patent applications pending       21                
Number of financial institutions 1,420                      
Number of companies deployed Mobile Deposit 805                      
Number of U.S. retail banks and payment processing companies 33                      
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 323,383 140,146 42,133                  
Property and equipment purchased under a capital lease 95,388 95,388                    
Fixed assets acquired under capital leases 2,257,895 880,338             0      
Depreciation expense under capital lease             19,078 17,488        
Accumulated depreciation 628,231 460,223         36,566 17,488        
Total repairs and maintenance expenses 97,532 57,815 43,115                  
Impairment cost 0 0 0                  
Software development costs capitalized 0 0                    
Amortization of software development costs                   0 91,438 137,157
Tax benefit is measured based on the largest benefit Greater than 50%                      
Advertising costs 123,905 72,053 76,026                  
Accumulated other comprehensive gain (loss) $ 1,838 $ (616)