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Net Loss Per Share and Net Loss Attributable to Common Stockholders - Basic and Diluted Net Income (Loss) per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net loss $ (6,374)us-gaap_NetIncomeLoss $ (7,299)us-gaap_NetIncomeLoss
Net loss available to common stockholders(1) $ (6,374)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (7,299)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic weighted average common shares outstanding (shares) 371,959,312us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 55,780,644us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average common shares outstanding (shares) 371,959,312us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 55,780,644us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per common share:    
Basic ($ per share) $ (0.02)us-gaap_EarningsPerShareBasic $ (0.13)us-gaap_EarningsPerShareBasic
Diluted ($ per share) $ (0.02)us-gaap_EarningsPerShareDiluted $ (0.13)us-gaap_EarningsPerShareDiluted