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Business Combinations - Summary of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets acquired |  |
Goodwill | $ 25,278 | $ 15,621
SubCon and MICOS Telcom [Member] |  |
Assets acquired |  |
Current assets, net of cash | 5,976 |
Property, plant and equipment | 2,669 |
Goodwill | 10,403 |
Finite-lived intangible assets | 8,144 |
Other long-term assets | 1,883 |
Total assets acquired | 29,075 |
Liabilities assumed | (10,181) |
Net assets acquired | $ 18,894 |

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