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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
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net (loss) income: $ (14,941) $ 6,649
Dividend and dividend requirements (7,350)  
Accretion of redeemable preferred stocks (2,243)  
Total dividends, dividend requirements and accretion on preferred stocks (9,668) (300)
Net income (loss) attributable to common stockholders (24,609) 6,349
Dividends on convertible preferred stocks assumed to be converted, if dilutive   60
Numerator for diluted net income (loss) per common share $ (24,609) $ 6,409
Denominator:    
Denominator for basic net income (loss) per common share - weighted- average shares 22,868,307 22,674,739
Effect of dilutive securities:    
Convertible preferred stocks   250,000
Stock options   121,763
Dilutive potential common shares   371,763
Denominator for dilutive net income (loss) per common share - adjusted weighted-average shares and assumed conversions 22,868,307 23,046,502
Basic and diluted net income (loss) per common share $ (1.08) $ 0.28
Series E Redeemable Preferred Stock [Member]    
Numerator:    
Dividend and dividend requirements $ (7,350)  
Accretion of redeemable preferred stocks (2,243)  
Series B Preferred Stock [Member]    
Numerator:    
Dividend and dividend requirements (60) $ (240)
Series D Preferred Stock [Member]    
Numerator:    
Dividend and dividend requirements $ (15) $ (60)