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Business Combination - Schedule of Estimated Fair Values of Assets acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | May 23, 2018 | Oct. 16, 2017 | Sep. 30, 2017
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Business Acquisition [Line Items] |  |  |  |
Current assets |  | $ 6,673 |  |
Property, plant and equipment |  | 390 |  |
Intangible assets |  | 35,017 |  |
Goodwill | $ 34,049 | 31,235 |  | $ 3,014
Other non-current assets |  | 1,223 |  |
Current liabilities |  | (4,315) |  |
Deferred income tax liabilities |  | (9,093) |  |
Other non-current liabilities |  | (847) |  |
Total consideration paid |  | 60,283 |  |
A2iA Group II, S.A.S. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  | 4,637 |  |
Property, plant and equipment |  | 307 |  |
Intangible assets |  | 28,610 |  |
Goodwill |  | 24,383 |  |
Other non-current assets |  | 1,136 |  |
Current liabilities |  | (2,747) |  |
Deferred income tax liabilities |  | (7,491) |  |
Other non-current liabilities |  | (19) |  |
Total consideration paid |  | $ 48,816 |  |
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) |
Deferred income tax liabilities |  |  | (1,602) |
Other non-current liabilities |  |  | (828) |
Total consideration paid |  |  | $ 11,467 |

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