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Stock-Based Compensation - Summary of Company's Stock Option Plan Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                    
Outstanding, Number of Options 110,000 140,000 150,000 230,000 110,000 150,000 110,000 140,000 110,000 230,000
Exercisable, Number of Options   140,000         110,000 140,000    
Exercised, Number of Options   (10,000) (80,000)              
Exercised, Weighted-Average Exercise Price           $ 2.50   $ 6.30    
Outstanding, Weighted Average Exercise Price $ 3.19 $ 3.04 $ 3.26 $ 3.00 $ 3.19 $ 3.26 $ 3.19 3.04 $ 3.19 $ 3.00
Exercisable, Weighted-Average Exercise Price   $ 3.04         $ 3.19 $ 3.04    
Outstanding, Weighted-Average Remaining Contractual Term 2 years 1 month 6 days     2 years 9 months 18 days 1 year 9 months 18 days 2 years 10 months 24 days 1 year 7 months 6 days 2 years 4 months 24 days 2 years 3 months 18 days 3 years
Exercisable, Weighted-Average Remaining Contractual Term             1 year 7 months 6 days 2 years 4 months 24 days    
Outstanding, Aggregate Intrinsic Value $ 3,312 $ 5,002 $ 6,142 $ 9,861 $ 2,650 $ 6,142 $ 2,989 $ 5,002 $ 3,482 $ 9,256
Exercisable, Aggregate Intrinsic Value   $ 5,002         $ 2,989 $ 5,002