Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail)

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Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 93 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Numerator:      
Net loss attributed to common stockholders $ (7,370) $ (8,858) $ (134,573)
Denominator:      
Weighted-average common shares outstanding-denominator for basic and diluted net loss per share 35,900,596 25,182,369  
Basic and diluted net loss per common share attributed to common stockholders $ (0.21) $ (0.35)