Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Scheduleof Intangible Assetby Major Class [Line Items]
Intangible Assets, Gross (Excluding Goodwill), Total	$ 10,675	$ 10,073
Finite Lived Intangible Assets, Accumulated Amortization	5,385	4,071
Trademark
Scheduleof Intangible Assetby Major Class [Line Items]
Weighted average life	Indefinite
Indefinite-lived intangible assets	833	833
Patents and licenses, software and hardware designs
Scheduleof Intangible Assetby Major Class [Line Items]
Weighted average life	6 years
Finite-lived intangible assets, gross	4,222	3,620
Finite Lived Intangible Assets, Accumulated Amortization	2,171	1,461
Developed technology
Scheduleof Intangible Assetby Major Class [Line Items]
Weighted average life	10 years
Finite-lived intangible assets, gross	2,782	2,782
Finite Lived Intangible Assets, Accumulated Amortization	1,461	1,182
Customer relationships and non-compete
Scheduleof Intangible Assetby Major Class [Line Items]
Weighted average life	9 years
Finite-lived intangible assets, gross	2,838	2,838
Finite Lived Intangible Assets, Accumulated Amortization	$ 1,753	$ 1,428