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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss): | $ (13,045) | $ (26,084) | $ (27,506) | $ (5,591) | $ 914 | $ (17,112) | $ (7,033) | $ (5,986) | $ (72,226) | $ (29,217) | $ 112,168
Adjustments for basic net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend accrued on redeemable preferred stock |  |  |  |  |  |  |  |  | (26,840) | (23,443) | (27,761)
Dividend requirements |  |  |  |  |  |  |  |  | (300) | (300) | (300)
Net income attributable to participating securities |  |  |  |  |  |  |  |  |  |  | (1,091)
Net income (loss) attributable to common stockholders | $ (20,705) | $ (33,422) | $ (35,011) | $ (13,603) | $ (6,991) | $ (24,745) | $ (14,515) | $ (13,196) | $ (102,741) | $ (59,447) | $ 64,760
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and dilutive net income (loss) per common share - adjusted weighted-average shares |  |  |  |  |  |  |  |  | 27,490,717 | 27,250,876 | 25,454,311
Basic and dilutive income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations |  |  |  |  | $ (0.30) | $ (0.91) | $ (0.53) | $ (0.48) | $ (3.74) | $ (2.22) | $ (5.28)
Income from discontinued operations, net of taxes |  |  |  |  | 0.04 |  |  |  |  | 0.04 | 7.82
Net income (loss) | $ (0.75) | $ (1.22) | $ (1.27) | $ (0.49) | $ (0.26) | $ (0.91) | $ (0.53) | $ (0.48) | $ (3.74) | $ (2.18) | $ 2.54
Series E Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Adjustments for basic net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend accrued on redeemable preferred stock |  |  |  |  |  |  |  |  | $ (26,840) | $ (23,443) | $ (27,761)
Accretion of redeemable preferred stocks |  |  |  |  |  |  |  |  | (3,375) | (6,487) | (18,256)
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Adjustments for basic net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend requirements |  |  |  |  |  |  |  |  | (240) | (240) | (240)
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Adjustments for basic net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend requirements |  |  |  |  |  |  |  |  | $ (60) | $ (60) | $ (60)

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