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Loss Per Common Share - Computation of Basic and Diluted Net Loss Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Numerator: |  |  |  |  |  |  |  |
Net loss | $ (30,794) | $ 6,631 | $ (11,540) | $ (26,084) | $ (27,506) | $ (5,591) | $ (35,703) | $ (59,181)
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |
Dividend accrued on redeemable preferred stock | (7,764) | $ (7,589) | $ (7,256) | (6,782) | $ (6,628) | $ (6,338) |  |
Dividend requirements | (75) |  |  | (75) |  |  | (225) | (225)
Net loss attributable to common stockholders | $ (39,133) |  |  | $ (33,422) |  |  | $ (60,030) | $ (82,036)
Denominator: |  |  |  |  |  |  |  |
Denominator for basic and dilutive net loss per common share - adjusted weighted-average shares | 28,065,519 |  |  | 27,500,323 |  |  | 28,025,130 | 27,484,227
Basic and dilutive net loss per common share | $ (1.39) |  |  | $ (1.22) |  |  | $ (2.14) | $ (2.98)
Series E Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |
Dividend accrued on redeemable preferred stock | $ (7,764) |  |  | $ (6,782) |  |  | $ (22,609) | $ (19,748)
Accretion of redeemable preferred stock | (500) |  |  | (481) |  |  | (1,493) | (2,882)
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |
Dividend requirements | (60) |  |  | (60) |  |  | (180) | (180)
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |
Adjustments for basic net loss per common share: |  |  |  |  |  |  |  |
Dividend requirements | $ (15) |  |  | $ (15) |  |  | $ (45) | $ (45)

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