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Business Combinations - Summary of Final Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets acquired |  |  |
Goodwill | $ 29,508 | $ 27,840 | $ 15,621
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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