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Business Combination - Schedule of Estimated Fair Values of Assets acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 17, 2015
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Business Acquisition [Line Items] |  |  |
Goodwill | $ 2,725 | $ 2,863 |
IDchecker |  |  |
Business Acquisition [Line Items] |  |  |
Current assets |  |  | $ 620
Property, plant and equipment |  |  | 42
Intangible assets |  |  | 3,570
Assets acquired |  |  | 4,232
Current liabilities |  |  | (476)
Other liabilities |  |  | (810)
Liabilities assumed |  |  | (1,286)
Fair value of net assets acquired |  |  | 2,946
Total consideration paid |  |  | 5,819
Effect of movements in exchange rates as of March 31, 2017 | $ (148) |  |
Goodwill |  |  | $ 2,873

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