Commitments and Contingencies - Additional Information (Detail) - 9 months ended Jun. 30, 2016	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