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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Sep. 30, 2015
USD ($)
Institution
Segment
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Nov. 30, 2015
Patents
Property Plant And Equipment [Line Items]        
Number of financial institutions signed agreements to deploy mobile deposit | Institution 4,495      
Number of top U.S. retail banks that deployed mobile deposit | Institution 50      
Foreign currency translation adjustment $ 318 $ 0    
Number of reporting unit | Segment 1      
Goodwill impairment $ 0      
Other-than-temporary impairment charges recognized 0 0 $ 0  
Allowance for doubtful accounts 0 0    
Allowance for doubtful accounts receivable $ 12,900 6,100    
Deferred software maintenance fees amortization period 1 year      
Depreciation and amortization of property and equipment total $ 433,296 470,697 323,383  
Fixed assets acquired under capital leases 2,504,935 2,385,390    
Total repairs and maintenance expenses 127,143 115,792 97,532  
Impairment charges 0 0 0  
Software development costs capitalized $ 0 0    
Tax benefit is measured based on the largest benefit Greater than 50%      
Advertising costs $ 201,882 99,670 123,905  
Number of Operating Segments | Segment 1      
Accumulated other comprehensive (loss) income $ (3,241) (7,810)    
Minimum [Member]        
Property Plant And Equipment [Line Items]        
Property and equipment, estimated useful lives 3 years      
Maximum [Member]        
Property Plant And Equipment [Line Items]        
Property and equipment, estimated useful lives 5 years      
Assets acquired under capital leases [Member]        
Property Plant And Equipment [Line Items]        
Fixed assets acquired under capital leases $ 95,388 95,388    
Equipment [Member]        
Property Plant And Equipment [Line Items]        
Fixed assets acquired under capital leases 1,281,161 1,177,364    
Depreciation expense under capital lease 19,078 19,078 $ 19,078  
Accumulated depreciation $ 74,722 $ 55,644    
Subsequent Event        
Property Plant And Equipment [Line Items]        
Number of patents granted | Patents       22
Number of patent applications pending | Patents       21