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Net Income Loss and the Number of Shares Used to Compute Basic and Diluted Earnings per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Loss Per Share [Line Items]    
Net loss $ (31,126)us-gaap_NetIncomeLoss $ (25,980)us-gaap_NetIncomeLoss
Preferred stock purchase option (see Note 8) (868)us-gaap_PreferredStockDividendsAndOtherAdjustments  
Net loss applicable to common shareholders-basic (31,994)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (25,980)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Gain on warrant derivative liability (119)us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther (965)us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
Net loss-diluted $ (32,113)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (26,945)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Net loss per share-basic $ (0.18)us-gaap_EarningsPerShareBasic $ (0.15)us-gaap_EarningsPerShareBasic
Weighted average shares outstanding-basic 175,582us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 172,872us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive warrants   1,559us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Weighted average shares outstanding-diluted 175,582us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 174,431us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income loss per share-diluted $ (0.18)us-gaap_EarningsPerShareDiluted $ (0.15)us-gaap_EarningsPerShareDiluted