Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Year	Dec. 31, 2010
Intangible Assets by Major Class [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 10,678	$ 10,015
Finite-Lived Intangible Assets, Accumulated Amortization	3,043	1,912
Patents and licenses, software and hardware designs
Intangible Assets by Major Class [Line Items]
Weighted average life	6
Finite-lived intangible assets, gross	4,225	3,562
Finite-Lived Intangible Assets, Accumulated Amortization	1,661	1,144
Developed technology
Intangible Assets by Major Class [Line Items]
Weighted average life	10
Finite-lived intangible assets, gross	2,782	2,782
Finite-Lived Intangible Assets, Accumulated Amortization	626	348
Customer relationships and non-compete
Intangible Assets by Major Class [Line Items]
Weighted average life	9
Finite-lived intangible assets, gross	2,838	2,838
Finite-Lived Intangible Assets, Accumulated Amortization	756	420
Trademark
Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets	$ 833	$ 833