Business Combination - Schedule of Estimated Fair Values of Assets acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 17, 2015
Business Acquisition [Line Items]
Goodwill as of December 31, 2016	$ 2,683	$ 2,863
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Business Acquisition [Line Items]
Current assets			$ 620
Property, plant and equipment			42
Intangible assets			3,570
Assets acquired			4,232
Current liabilities			(476)
Other liabilities			(810)
Liabilities assumed			(1,286)
Fair value of net assets acquired			2,946
Total consideration paid			5,819
Goodwill before effect in exchange rates as of June 17, 2015			2,873
Effect of movements in exchange rates as of December 31, 2016	(190)
Goodwill as of December 31, 2016	$ 2,683		$ 2,900