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 |