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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive securities excluded from computation of diluted net loss per common share 5,438 5,147 5,185
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 72 109 480
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 5,366 5,038 4,705