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Business Combination - Summary of Fair Values of Assets Acquired and Liabilities Assumed as of Acquisition Date (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jan. 20, 2017
Business Acquisition [Line Items]
Goodwill	$ 12,005	$ 12,005
Conexio [Member]
Business Acquisition [Line Items]
Inventory			$ 1,040
Property, plant and equipment			97
Intangible assets			155
Goodwill			85
Assumed liabilities			(82)
Total acquisition consideration			$ 1,295

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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