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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	Nov. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Assets
Goodwill		$ 6,968	$ 7,106
SmartRG Inc [Member]
Assets
Tangible assets acquired	$ 8,594
Intangible assets	9,960
Goodwill	3,476
Total assets acquired	22,030
Liabilities
Liabilities assumed	(6,001)
Total liabilities assumed	(6,001)
Total purchase price	$ 16,029

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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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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