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Basic and Diluted Net Loss Per Share of Common Stock (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net loss $ (26,533) $ (4,519)
Denominator:    
Weighted average shares outstanding, basic and diluted 33,678,706 28,345,555
Net loss per share, basic and diluted:    
Net loss per share $ (0.79) $ (0.16)
Antidilutive securities excluded from calculations of diluted net loss per share 3,870,508 5,761,065