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Net Loss Per Share - Additional Information (Detail) (Stock Options [Member])
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted average diluted securities excluded from diluted net loss per share 9.3 15.3