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Income Taxes - Schedule of Components of Income Before Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
United States $ (33,717) $ (40,370) $ (47,860)
Foreign         
Loss before income taxes $ (33,717) $ (40,370) $ (47,860)