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Net Loss Per Share of Common Stock - Calculation of Basic and Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator:    
Net loss attributable to stockholders $ (37,452)us-gaap_NetIncomeLoss $ (832)us-gaap_NetIncomeLoss
Denominator:    
Basic and diluted weighted-average common shares 584,519,396us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 198,214,456us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic net loss per share $ (0.06)us-gaap_EarningsPerShareBasic $ 0.00us-gaap_EarningsPerShareBasic
Diluted net loss per share $ (0.06)us-gaap_EarningsPerShareDiluted $ 0.00us-gaap_EarningsPerShareDiluted