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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2018 | Mar. 19, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 7,000 |  | $ 7,100
Bargain purchase gain net of income taxes |  |  |  | $ 11,322 |
Acquisition and integration related expenses and amortization of acquired intangibles |  |  | $ 1,300 | 200 |
SmartRG Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of acquisition |  |  | Nov. 30, 2018 |  |
Business acquisition, description |  |  | On November 30, 2018, we acquired SmartRG, Inc., a provider of carrier-class, open-source connected home platforms and cloud services for broadband service providers in exchange for cash consideration. This transaction was accounted for as a business combination. We have included the financial results of this acquisition in our consolidated financial statements since the date of acquisition. This revenue is included in the Subscriber Solutions & Experience category within the Network Solutions and Services & Support reportable segments. |  |
Business combination, contingent consideration, liability | $ 1,200 |  | $ 1,200 |  |
Minimum potential payment under contingent liability | 0 |  |  |  |
Maximum potential payment under contingent liability | 1,500 |  |  |  |
Change in fair value |  |  | 0 |  |
Business combination escrow amount | 2,800 |  |  |  |
Goodwill |  |  | $ 3,500 |  |
SmartRG Inc [Member] | Minimum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination potential release of funds | 0 |  |  |  |
SmartRG Inc [Member] | Maximum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination potential release of funds | $ 2,800 |  |  |  |
Sumitomo [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of acquisition |  |  | Mar. 19, 2018 |  |
Business acquisition, description |  |  | On March 19, 2018, we acquired Sumitomo Electric Lightwave Corp.’s (SEL) North American EPON business and entered into a technology license and OEM supply agreement with Sumitomo Electric Industries, Ltd. (SEI). |  |
Bargain purchase gain net of income taxes |  | $ 11,322 |  | $ 11,300 |

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + 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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