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Commitments and Contingencies - Additional Information (Detail) - 6 months ended Mar. 31, 2016 € in Millions | USD ($) ft² | EUR (€) ft²
--- | --- | ---
Loss Contingencies [Line Items] |  |
Expiration date of term of lease | Jun. 30, 2019 |
Annual base rent | $ 500,000 |
Increased percentage of Company's annual base rent | 3.00% | 3.00%
Tenant improvement allowances | $ 700,000 |
Unamortized lease incentives | $ 300,000 |
ID Checker [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 | 22,523 | 22,523
Other current liabilities [Member] |  |
Loss Contingencies [Line Items] |  |
Unamortized lease incentives | $ 100,000 |
Other non-current liabilities [Member] |  |
Loss Contingencies [Line Items] |  |
Unamortized lease incentives | 200,000 |
Standby letter of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Standby letter of credit to the landlord | $ 200,000 |

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