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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 |

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