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Income (Loss) Per Common Share - Computation of Basic and Diluted Net Income (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Numerator: |  |  |  |
Net income (loss) | $ (7,033) | $ 15,091 | $ (13,019) | $ 150
Adjustments for basic net income (loss) per common share: |  |  |  |
Dividend requirements | (75) | (75) | (150) | (150)
Net income attributable to participating securities |  | (91) |  |
Net income (loss) attributable to common stockholders | $ (14,515) | $ 5,055 | $ (27,711) | $ (19,463)
Denominator: |  |  |  |
Denominator for basic and dilutive net income (loss) per common share - adjusted weighted-average shares | 27,249,304 | 25,240,224 | 27,248,682 | 23,822,768
Basic net income (loss) per common share: |  |  |  |
Loss from continuing operations | $ (0.53) | $ (0.70) | $ (1.02) | $ (1.81)
Income from discontinued operations, net of taxes |  | 0.90 |  | 0.99
Net income (loss) | (0.53) | 0.20 | (1.02) | (0.82)
Diluted net income (loss) per common share: |  |  |  |
Loss from continuing operations | (0.53) | (0.70) | (1.02) | (1.81)
Income from discontinued operations, net of taxes |  | 0.90 |  | 0.99
Net income (loss) | $ (0.53) | $ 0.20 | $ (1.02) | $ (0.82)
Series E Redeemable Preferred Stock [Member] |  |  |  |
Adjustments for basic net income (loss) per common share: |  |  |  |
Dividend requirements on Series E Redeemable Preferred | $ (5,789) | $ (7,629) | $ (11,325) | $ (14,979)
Accretion of redeemable preferred stock | (1,618) | (2,241) | (3,217) | (4,484)
Series B Preferred Stock [Member] |  |  |  |
Adjustments for basic net income (loss) per common share: |  |  |  |
Dividend requirements | (60) | (60) | (120) | (120)
Series D Preferred Stock [Member] |  |  |  |
Adjustments for basic net income (loss) per common share: |  |  |  |
Dividend requirements | $ (15) | $ (15) | $ (30) | $ (30)

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