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Shares Underlying Stock Options, Excluded from Calculation of Weighted Average Number of Shares Outstanding used for Calculation of Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted average number of anti-dilutive potential shares-outstanding options 14,986 13,439