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Business Combinations - Preliminary and 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 | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Mar. 19, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2017
Assets |  |  |  |  |  |
Goodwill |  |  |  | $ 7,106 |  | $ 3,492
Liabilities |  |  |  |  |  |
Gain on bargain purchase of a business, net of tax |  |  |  | $ (11,322) | $ (3,542) |
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 |  |  |  |
SmartRG Inc [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Tangible assets acquired | $ 8,594 |  |  |  |  |
Intangible assets | 9,960 |  |  |  |  |
Goodwill | 3,614 |  |  |  |  |
Total assets acquired | 22,168 |  |  |  |  |
Liabilities |  |  |  |  |  |
Liabilities assumed | (6,126) |  |  |  |  |
Total liabilities assumed | (6,126) |  |  |  |  |
Total net assets | 16,042 |  |  |  |  |
Total purchase price | $ 16,042 |  |  |  |  |

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- Definition Business combination recognized identifiable assets acquired and liabilities assumed tangible assets acquired. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6571-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6527-128477 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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