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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 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:            
Net income (loss) $ 6,631 $ (11,540) $ (27,506) $ (5,591) $ (4,909) $ (33,097)
Adjustments for basic net loss per common share:            
Dividend accrued on redeemable preferred stock (7,589) $ (7,256) (6,628) $ (6,338)    
Dividend requirements (75)   (75)   (150) (150)
Net loss attributable to common stockholders $ (1,530)   $ (35,011)   $ (20,897) $ (48,614)
Denominator:            
Denominator for basic and dilutive net loss per common share - adjusted weighted-average shares 28,050,848   27,492,979   28,004,936 27,476,180
Basic and dilutive net loss per common share: $ (0.05)   $ (1.27)   $ (0.75) $ (1.77)
Series E Redeemable Preferred Stock [Member]            
Adjustments for basic net loss per common share:            
Dividend accrued on redeemable preferred stock $ (7,589)   $ (6,628)   $ (14,845) $ (12,966)
Accretion of redeemable preferred stock (497)   (802)   (993) (2,401)
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)