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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
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (19,452)	$ (11,540)
Adjustments for basic net loss per common share:
Dividend accrued on redeemable preferred stock	(8,307)	(7,256)
Dividend requirements	(75)	(75)
Net loss attributable to common stockholders	$ (28,338)	$ (19,367)
Denominator:
Denominator for basic and dilutive net loss per common share - adjusted weighted-average shares	28,176,205	27,959,024
Basic and dilutive net loss per common share	$ (1.01)	$ (0.69)
Series E Redeemable Preferred Stock [Member]
Adjustments for basic net loss per common share:
Dividend accrued on redeemable preferred stock	$ (8,307)	$ (7,256)
Accretion of redeemable preferred stock	(504)	(496)
Series B Preferred Stock [Member]
Adjustments for basic net loss per common share:
Dividend requirements	(60)	(60)
Series D Preferred Stock [Member]
Adjustments for basic net loss per common share:
Dividend requirements	$ (15)	$ (15)

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