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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 |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Mar. 19, 2018 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Assets |  |  |  |  |
Goodwill |  |  |  | $ 6,982 | $ 7,106
Liabilities |  |  |  |  |
Gain on bargain purchase of a business, net of tax |  |  | $ (11,322) |  |
SmartRG Inc [Member] |  |  |  |  |
Assets |  |  |  |  |
Tangible assets acquired | $ 8,594 |  |  |  |
Intangible assets | 9,960 |  |  |  |
Goodwill | 3,489 |  |  |  |
Total assets acquired | 22,043 |  |  |  |
Liabilities |  |  |  |  |
Liabilities assumed | (6,001) |  |  |  |
Total liabilities assumed | (6,001) |  |  |  |
Total net assets | 16,042 |  |  |  |
Total purchase price | $ 16,042 |  |  |  |
Sumitomo [Member] |  |  |  |  |
Assets |  |  |  |  |
Tangible assets acquired |  | $ 1,006 |  |  |
Intangible assets |  | 22,100 |  |  |
Total assets acquired |  | 23,106 |  |  |
Liabilities |  |  |  |  |
Liabilities assumed |  | (3,978) |  |  |
Total liabilities assumed |  | (3,978) |  |  |
Total net assets |  | 19,128 |  |  |
Gain on bargain purchase of a business, net of tax |  | (11,322) | $ (11,300) |  |
Total purchase price |  | $ 7,806 |  |  |

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