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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net (loss) income: $ (8,068) $ (33,763) $ 417 $ 6,649 $ 657 $ (3,777) $ 11,113 $ 11,641 $ (34,765) $ 19,634 $ 54,962
Dividend requirements on Series E Redeemable Preferred                 (2,287)    
Dividends                 (300) (300) (300)
Accretion of redeemable preferred stocks                 (686)    
Total dividends, dividend requirements and accretion on preferred stocks                 (3,273) (300) (300)
Net income (loss) attributable to common stockholders $ (11,041) $ (33,763) $ 417 $ 6,349 $ 657 $ (3,777) $ 11,113 $ 11,341 (38,038) 19,334 54,662
Dividends on convertible preferred stocks assumed to be converted, if dilutive                 300 300 300
Numerator for diluted net income (loss) per common share                 $ (37,738) $ 19,634 $ 54,962
Denominator:                      
Denominator for basic net income (loss) per common share - weighted- average shares                 22,758,873 22,575,053 22,465,176
Effect of dilutive securities:                      
Convertible preferred stocks                   916,666 916,666
Stock options                   175,751 215,124
Dilutive potential common shares                   1,092,417 1,131,790
Denominator for dilutive net income (loss) per common share - adjusted weighted-average shares and assumed conversions                 22,758,873 23,667,470 23,596,966
Basic net income (loss) per common share $ (0.48) $ (1.48) $ 0.02 $ 0.28 $ 0.03 $ (0.17) $ 0.49 $ 0.50 $ (1.67) $ 0.86 $ 2.43
Diluted net income (loss) per common share $ (0.48) $ (1.48) $ 0.02 $ 0.28 $ 0.03 $ (0.17) $ 0.47 $ 0.49 $ (1.67) $ 0.83 $ 2.33
Series E Redeemable Preferred Stock                      
Numerator:                      
Dividend requirements on Series E Redeemable Preferred                 $ (2,287)    
Accretion of redeemable preferred stocks                 (686)    
Series B Preferred Stock [Member]                      
Numerator:                      
Dividends                 (240) $ (240) $ (240)
Series D Preferred Stock [Member]                      
Numerator:                      
Dividends                 $ (60) $ (60) $ (60)