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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (27,714) | $ (30,794) | $ 6,631 | $ (11,540) | $ (13,045) | $ (26,084) | $ (27,506) | $ (5,591) | $ (63,417) | $ (72,226) | $ (29,217)
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend accrued on redeemable preferred stock |  |  |  |  |  |  |  |  | (30,729) | (26,840) | (23,443)
Dividend requirements |  |  |  |  |  |  |  |  | (300) | (300) | (300)
Net loss attributable to common stockholders | $ (36,411) | $ (39,133) | $ (1,530) | $ (19,367) | $ (20,705) | $ (33,422) | $ (35,011) | $ (13,603) | $ (96,441) | $ (102,741) | $ (59,447)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and dilutive net loss per common share - adjusted weighted-average shares |  |  |  |  |  |  |  |  | 28,039,625 | 27,490,717 | 27,250,876
Basic and dilutive income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations |  |  |  |  |  |  |  |  | $ (3.44) | $ (3.74) | $ (2.22)
Income from discontinued operations, net of taxes |  |  |  |  |  |  |  |  |  |  | 0.04
Net loss | $ (1.30) | $ (1.39) | $ (0.05) | $ (0.69) | $ (0.75) | $ (1.22) | $ (1.27) | $ (0.49) | $ (3.44) | $ (3.74) | $ (2.18)
Series E Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend accrued on redeemable preferred stock |  |  |  |  |  |  |  |  | $ (30,729) | $ (26,840) | $ (23,443)
Accretion of redeemable preferred stock |  |  |  |  |  |  |  |  | (1,995) | (3,375) | (6,487)
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend requirements |  |  |  |  |  |  |  |  | (240) | (240) | (240)
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |  |  |  |
Dividend requirements |  |  |  |  |  |  |  |  | $ (60) | $ (60) | $ (60)

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