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Summary of Significant Accounting Policies - Outstanding Options, Warrants and Restricted Stock Units (Detail)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 33,738,929us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 19,794,450us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Options [Member]    
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 276,229us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
381,851us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Restricted stock units [Member]    
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 9,984,519us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
3,144,940us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
Outstanding Warrants [Member]    
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 23,478,181us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
16,267,659us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember