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Earnings Per Share ("EPS") - Schedule of Reconciliation of Weighted Average Shares Used in Diluted EPS (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Line Items]        
Weighted average common shares-basic 18,957,876 18,562,204 18,847,728 18,460,848
Effect of dilutive securities        
Weighted average common shares-diluted 18,957,876 18,562,204 18,847,728 18,864,169
Stock Options And Stock Purchase Plan [Member]        
Effect of dilutive securities        
Effect of diluted securities       312,320
Restricted Stock Units [Member]        
Effect of dilutive securities        
Effect of diluted securities       91,001