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Restricted Stock Units - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 2 years 10 months 24 days    
Nonvested Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation liability, Current, total $ 1,463,000 $ 816,000 $ 503,000
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options $ 2,100,000    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 1 year 10 months 24 days    
Share based compensation arrangement by share based payment award non option equity instruments grants in period weighted average grant date fair value $ 3.74 $ 2.94  
Restricted stock units granted 660,331 380,000 0