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Business Combinations - Preliminary Allocation of the Purchase Price to the Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 19, 2018 | Mar. 31, 2018 | Sep. 30, 2018
Liabilities |  |  |
Gain on bargain purchase of a business, net of tax |  |  | $ (11,322)
Total purchase price |  |  | $ 7,806
Sumitomo Electric Lightwave Corp.'s North American EPON Business [Member] |  |  |
Assets |  |  |
Other receivables | $ 104 |  |
Inventory | 510 |  |
Property, plant and equipment | 392 |  |
Intangible assets | 22,100 |  |
Total assets acquired | 23,106 |  |
Liabilities |  |  |
Deferred income taxes | (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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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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