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Net Loss Per Share (Common Shares Excluded from Net Loss) (Detail) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
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 27,959 33,719 47,727 33,719
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 21,517 22,308 37,418 22,308
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 6,442 11,411 10,309 11,411