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Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended
Sep. 30, 2016
USD ($)
ft²
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2016
EUR (€)
ft²
Loss Contingencies [Line Items]        
Commencement date of term of lease Oct. 01, 2016      
Expiration date of term of lease Apr. 30, 2020      
Annual base rent $ 600,000      
Tenant improvement allowances $ 300,000      
Previous facility lease termination date Oct. 16, 2016      
Unamortized lease incentives $ 49,000      
Rent expense for the Company's operating leases $ 300,000 $ 400,000 $ 400,000  
IDchecker [Member]        
Loss Contingencies [Line Items]        
Expiration date of term of lease May 31, 2020      
Annual base rent | €       € 48,000
Building [Member]        
Loss Contingencies [Line Items]        
Amended office space subject to the lease | ft² 28,354     28,354
Sales office [Member]        
Loss Contingencies [Line Items]        
Expiration date of term of lease May 31, 2017      
Annual base rent | €       € 65,000
Defined contribution 401 K Plan [Member]        
Loss Contingencies [Line Items]        
Employer contribution amount $ 63,000 $ 42,000 $ 0