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Income (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								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income (loss):	$ (13,045)	$ (26,084)	$ (27,506)	$ (5,591)	$ 914	$ (17,112)	$ (7,033)	$ (5,986)	$ (72,226)	$ (29,217)	$ 112,168
Adjustments for basic net income (loss) per common share:
Dividend accrued on redeemable preferred stock									(26,840)	(23,443)	(27,761)
Dividend requirements									(300)	(300)	(300)
Net income attributable to participating securities											(1,091)
Net income (loss) attributable to common stockholders	$ (20,705)	$ (33,422)	$ (35,011)	$ (13,603)	$ (6,991)	$ (24,745)	$ (14,515)	$ (13,196)	$ (102,741)	$ (59,447)	$ 64,760
Denominator:
Denominator for basic and dilutive net income (loss) per common share - adjusted weighted-average shares									27,490,717	27,250,876	25,454,311
Basic and dilutive income (loss) per common share:
Loss from continuing operations					$ (0.30)	$ (0.91)	$ (0.53)	$ (0.48)	$ (3.74)	$ (2.22)	$ (5.28)
Income from discontinued operations, net of taxes					0.04					0.04	7.82
Net income (loss)	$ (0.75)	$ (1.22)	$ (1.27)	$ (0.49)	$ (0.26)	$ (0.91)	$ (0.53)	$ (0.48)	$ (3.74)	$ (2.18)	$ 2.54
Series E Redeemable Preferred Stock [Member]
Adjustments for basic net income (loss) per common share:
Dividend accrued on redeemable preferred stock									$ (26,840)	$ (23,443)	$ (27,761)
Accretion of redeemable preferred stocks									(3,375)	(6,487)	(18,256)
Series B Preferred Stock [Member]
Adjustments for basic net income (loss) per common share:
Dividend requirements									(240)	(240)	(240)
Series D Preferred Stock [Member]
Adjustments for basic net income (loss) per common share:
Dividend requirements									$ (60)	$ (60)	$ (60)

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