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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net loss	$ (27,506)	$ (7,033)	$ (33,097)	$ (13,019)
Adjustments for basic net loss per common share:
Dividend requirements on Series E Redeemable Preferred			(12,966)
Dividend requirements	(75)	(75)	(150)	(150)
Accretion of redeemable preferred stock			(2,401)
Net loss attributable to common stockholders	$ (35,011)	$ (14,515)	$ (48,614)	$ (27,711)
Denominator:
Denominator for basic and dilutive net loss per common share - adjusted weighted-average shares	27,492,979	27,249,304	27,476,180	27,248,682
Basic and dilutive net loss per common share:	$ (1.27)	$ (0.53)	$ (1.77)	$ (1.02)
Series E Redeemable Preferred Stock [Member]
Adjustments for basic net loss per common share:
Dividend requirements on Series E Redeemable Preferred	$ (6,628)	$ (5,789)	$ (12,966)	$ (11,325)
Accretion of redeemable preferred stock	(802)	(1,618)	(2,401)	(3,217)
Series B Preferred Stock [Member]
Adjustments for basic net loss per common share:
Dividend requirements	(60)	(60)	(120)	(120)
Series D Preferred Stock [Member]
Adjustments for basic net loss per common share:
Dividend requirements	$ (15)	$ (15)	$ (30)	$ (30)

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