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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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