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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								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income (loss)	$ 42,082	$ (8,928)	$ 23,670	$ (13,279)	$ (21,692)	$ (20,402)	$ (365)	$ (19,452)	$ 43,545	$ (61,911)	$ (63,417)
Adjustments for basic and diluted net loss per common share:
Dividend accrued on redeemable preferred stock									(29,914)	(35,182)	(30,729)
Dividend requirements									(298)	(300)	(300)
Net loss attributable to common stockholders	$ 42,009	$ (251,504)	$ 12,646	$ (23,376)	$ (31,573)	$ (29,874)	$ (9,634)	$ (28,338)	$ (220,002)	$ (99,419)	$ (96,441)
Denominator:
Denominator for basic and diluted net loss per common share - adjusted weighted-average shares									49,963	36,664	36,455
Basic and diluted net loss per common share					$ (0.86)	$ (0.81)	$ (0.26)	$ (0.77)	$ (4.40)	$ (2.71)	$ (2.65)
Series E Redeemable Preferred Stock [Member]
Adjustments for basic and diluted net loss per common share:
Dividend accrued on redeemable preferred stock									$ (29,914)	$ (35,182)	$ (30,729)
Accretion of redeemable preferred stock									(1,523)	(2,026)	(1,995)
Series E and Series F Redeemable Preferred Stock [Member]
Adjustments for basic and diluted net loss per common share:
Deemed dividend									(231,812)
Series B Preferred Stock [Member]
Adjustments for basic and diluted net loss per common share:
Dividend requirements									(239)	(240)	(240)
Series D Preferred Stock [Member]
Adjustments for basic and diluted net loss per common share:
Dividend requirements									$ (59)	$ (60)	$ (60)

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