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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, 2013
Class of Stock [Line Items]  
Share reserved for share-based compensation 28,575,807
Outstanding warrants [Member]
 
Class of Stock [Line Items]  
Share reserved for share-based compensation 16,267,659
Stock Compensation Plan [Member]
 
Class of Stock [Line Items]  
Share reserved for share-based compensation 12,308,148