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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Numerator: |  |  |  |
Net loss | $ (26,084) | $ (17,112) | $ (59,181) | $ (30,131)
Adjustments for basic net loss per common share: |  |  |  |
Dividend requirements on Series E Redeemable Preferred |  |  | (19,748) |
Dividend requirements | (75) | (75) | (225) | (225)
Net loss attributable to common stockholders | $ (33,422) | $ (24,745) | $ (82,036) | $ (52,456)
Denominator: |  |  |  |
Denominator for basic and dilutive net loss per common share - adjusted weighted-average shares | 27,500,323 | 27,249,304 | 27,484,227 | 27,248,889
Basic and dilutive net loss per common share: | $ (1.22) | $ (0.91) | $ (2.98) | $ (1.93)
Series E Redeemable Preferred Stock [Member] |  |  |  |
Adjustments for basic net loss per common share: |  |  |  |
Dividend requirements on Series E Redeemable Preferred | $ (6,782) | $ (5,923) | $ (19,748) | $ (17,248)
Accretion of redeemable preferred stock | (481) | (1,635) | (2,882) | (4,852)
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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