Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule of Intangible Asset by Major Class [Line Items]
Intangible Assets, Gross Amount (Excluding Goodwill), Total	$ 10,653	$ 10,374
Finite-Lived Intangible Assets, Accumulated Amortization	$ 7,535	6,620
Patents and licenses, software and hardware designs
Schedule of Intangible Asset by Major Class [Line Items]
Weighted Average Life	6 years
Finite-Lived Intangible Assets, Gross Amount	$ 5,033	4,754
Finite-Lived Intangible Assets, Accumulated Amortization	$ 3,187	2,839
Developed technology
Schedule of Intangible Asset by Major Class [Line Items]
Weighted Average Life	10 years
Finite-Lived Intangible Assets, Gross Amount	$ 2,782	2,782
Finite-Lived Intangible Assets, Accumulated Amortization	$ 2,017	1,739
Customer relationships and non-compete
Schedule of Intangible Asset by Major Class [Line Items]
Weighted Average Life	9 years
Finite-Lived Intangible Assets, Gross Amount	$ 2,838	2,838
Finite-Lived Intangible Assets, Accumulated Amortization	$ 2,331	$ 2,042