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Debt - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Apr. 30, 2017
Jan. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Line of Credit Facility [Line Items]            
Loss on extinguishment of debt $ 384,000 $ 0        
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Credit facility 20,000,000   $ 5,000,000   $ 10,000,000  
Term Loan            
Line of Credit Facility [Line Items]            
Credit facility     20,000,000 $ 20,000,000   $ 10,000,000
Line of credit, outstanding borrowings 0          
Term Loan | Other (Income) Expense            
Line of Credit Facility [Line Items]            
Loss on extinguishment of debt $ 400,000          
Subordinated Term Loan            
Line of Credit Facility [Line Items]            
Credit facility     $ 10,000,000