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Common Stock - Reserved Shares of Common Stock for Exercise of Options, Warrants and Other Contingent Issuances of Common Stock (Detail)
Dec. 31, 2015
shares
Class of Stock [Line Items]  
Share reserved for share-based compensation 61,007,367
Warrants [Member]  
Class of Stock [Line Items]  
Share reserved for share-based compensation 44,277,849
Stock Compensation Plan [Member]  
Class of Stock [Line Items]  
Share reserved for share-based compensation 16,729,518