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Loss Per Share - Potential Dilutive Securities Excluded from Computation of Diluted Net Loss Per Common Share (Detail) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from computation of diluted net loss per common share 5,481 4,700
Unvested Restricted Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from computation of diluted net loss per common share 982 1,765
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from computation of diluted net loss per common share 4,499 2,935