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Stock-Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based incentive plans, options expiry term   10 years  
Number of Options, Granted   0 123,739
Weighted average remaining contractual term for Options outstanding   6 years 10 months 24 days  
Weighted average remaining contractual term for Options exercisable   5 years 6 months  
Aggregate intrinsic value for Options outstanding   $ 2,300,000  
Aggregate intrinsic value of Options exercisable   $ 1,000  
Stock Option granted exercise period   10 years  
Number of shares issued   102,710 48,158
Total compensation expense recognized on stock award   $ 720,000 $ 553,000
Total unrecognized compensation cost related to options   6,600,000  
Total unrecognized compensation cost related to nonvested stock awards   $ 6,600,000  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cost of stock awards recognized over a weighted average period   2 years 10 months 24 days  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards granted   102,710 48,158
Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cost of stock awards recognized over a weighted average period   2 years 8 months 12 days  
2015 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based incentive plans, options expiry term 10 years    
Shares authorized 1,400,000    
Number of Options, Granted   123,739  
Stock awards granted   285,541  
2015 Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for issuance calculation ratio 100.00%    
2015 Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for issuance calculation ratio 200.00%