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Net Loss Per Share (Common Shares Excluded from Net Loss) (Detail) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 33,496 17,534
Warrants to purchase common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 22,308 8,540
Options to purchase common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 11,188 8,994