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Carrying Value of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Technology rights $ 11,624 $ 11,624
Accumulated amortization (431) (269)
Intangible asset, net $ 11,193 $ 11,355