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Business Combination - Schedule of Estimated Fair Values of Assets acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Oct. 16, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 10,298 |  | $ 3,014
ICAR Vision Systems, S.L. |  |  |
Business Acquisition [Line Items] |  |  |
Current assets |  | $ 2,036 |
Property, plant and equipment |  | 83 |
Intangible assets |  | 6,407 |
Goodwill |  | 6,852 |
Other non-current assets |  | 87 |
Current liabilities |  | (1,568) |
Other non-current liabilities |  | (2,430) |
Total consideration paid |  | $ 11,467 |

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