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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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