Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets by Major Class [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 10,408	$ 10,678
Finite Lived Intangible Assets, Accumulated Amortization	3,680	3,043
Patents and licenses, software and hardware designs
Intangible Assets by Major Class [Line Items]
Weighted average life	6 years
Finite-lived intangible assets, gross	3,955	4,225
Finite Lived Intangible Assets, Accumulated Amortization	1,684	1,661
Developed technology
Intangible Assets by Major Class [Line Items]
Weighted average life	10 years
Finite-lived intangible assets, gross	2,782	2,782
Finite Lived Intangible Assets, Accumulated Amortization	904	626
Customer relationships and non-compete
Intangible Assets by Major Class [Line Items]
Weighted average life	9 years
Finite-lived intangible assets, gross	2,838	2,838
Finite Lived Intangible Assets, Accumulated Amortization	1,092	756
Trademark
Intangible Assets by Major Class [Line Items]
Weighted average life	Indefinite
Indefinite-lived intangible assets	$ 833	$ 833