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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, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net loss	$ (20,402)	$ (365)	$ (19,452)	$ (30,794)	$ 6,631	$ (11,540)	$ (40,219)	$ (35,703)
Adjustments for basic net loss per common share:
Dividend accrued on redeemable preferred stock	(8,889)	$ (8,689)	$ (8,307)	(7,764)	$ (7,589)	$ (7,256)
Dividend requirements	(75)			(75)			(225)	(225)
Net loss attributable to common stockholders	$ (29,874)			$ (39,133)			$ (67,846)	$ (60,030)
Denominator:
Denominator for basic and dilutive net loss per common share - adjusted weighted-average shares	28,211,905			28,065,519			28,195,691	28,025,130
Basic and dilutive net loss per common share	$ (1.06)			$ (1.39)			$ (2.41)	$ (2.14)
Series E Redeemable Preferred Stock [Member]
Adjustments for basic net loss per common share:
Dividend accrued on redeemable preferred stock	$ (8,889)			$ (7,764)			$ (25,885)	$ (22,609)
Accretion of redeemable preferred stock	(508)			(500)			(1,517)	(1,493)
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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