v3.5.0.2
Net Loss Per Common Share - Historical Outstanding Anti-Dilutive Securities (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding anti-dilutive securities 4.5 5.8 4.5 5.8
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding anti-dilutive securities 0.8 1.6 0.8 1.6
Unvested restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding anti-dilutive securities 3.7 4.2 3.7 4.2