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Net Loss Per Share - Additional Information (Detail) (Stock Options [Member])
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 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 10.6 13.3 9.8 13.0