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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net income (loss) $ (7,033) $ 15,091 $ (13,019) $ 150
Adjustments for basic net income (loss) per common share:        
Dividend requirements (75) (75) (150) (150)
Net income attributable to participating securities   (91)    
Net income (loss) attributable to common stockholders $ (14,515) $ 5,055 $ (27,711) $ (19,463)
Denominator:        
Denominator for basic and dilutive net income (loss) per common share - adjusted weighted-average shares 27,249,304 25,240,224 27,248,682 23,822,768
Basic net income (loss) per common share:        
Loss from continuing operations $ (0.53) $ (0.70) $ (1.02) $ (1.81)
Income from discontinued operations, net of taxes   0.90   0.99
Net income (loss) (0.53) 0.20 (1.02) (0.82)
Diluted net income (loss) per common share:        
Loss from continuing operations (0.53) (0.70) (1.02) (1.81)
Income from discontinued operations, net of taxes   0.90   0.99
Net income (loss) $ (0.53) $ 0.20 $ (1.02) $ (0.82)
Series E Redeemable Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend requirements on Series E Redeemable Preferred $ (5,789) $ (7,629) $ (11,325) $ (14,979)
Accretion of redeemable preferred stock (1,618) (2,241) (3,217) (4,484)
Series B Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend requirements (60) (60) (120) (120)
Series D Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend requirements $ (15) $ (15) $ (30) $ (30)