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Business Combinations - Summary of Final Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets acquired |  |
Goodwill | $ 27,689 | $ 27,840
SubCon and MICOS Telcom [Member] |  |
Assets acquired |  |
Current assets, net of cash | 5,976 |
Property, plant and equipment | 1,189 |
Goodwill | 12,132 |
Finite-lived intangible assets | 8,092 |
Other long-term assets | 1,883 |
Total assets acquired | 29,272 |
Liabilities assumed | (10,378) |
Net assets acquired | $ 18,894 |

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