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 |