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Business Combinations - Final Allocation of the Purchase Price to the Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Nov. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets |  |  |
Goodwill |  | $ 6,968 | $ 7,106
SmartRG Inc [Member] |  |  |
Assets |  |  |
Tangible assets acquired | $ 8,594 |  |
Intangible assets | 9,960 |  |
Goodwill | 3,476 |  |
Total assets acquired | 22,030 |  |
Liabilities |  |  |
Liabilities assumed | (6,001) |  |
Total liabilities assumed | (6,001) |  |
Total purchase price | $ 16,029 |  |

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