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Weighted Average Common Shares - Summary of Weighted Average Numbers of Common Shares Used to Compute Basic and Diluted Net (Loss) Income Per Share (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
[1]
Dec. 31, 2016
[1]
Dec. 31, 2015
Earnings Per Share [Abstract]      
Basic common shares outstanding 68,949 68,373 67,860
Common stock equivalents     468
Diluted common shares outstanding 68,949 68,373 68,328
[1] Due to the fact that we reported a loss from continuing operations for the years ended December 31, 2017 and 2016, potential common stock equivalents were excluded from the diluted common shares outstanding calculation. Per FASB ASC Topic 260 – Earnings per Share, an entity that reports discontinued operations shall use income or loss from continuing operations as the benchmark for calculating diluted common shares outstanding, and as such, we have zero common stock equivalents since these shares would have an anti-dilutive effect on our net loss per share for the years ended December 31, 2017 and 2016.