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Interim Financial Statements - Additional Information (Detail) - USD ($)
Nov. 06, 2019
Sep. 30, 2019
Jun. 11, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle of adoption       $ (51,000)   $ 17,000
Accounting Standards Update 2016-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle of adoption       $ 100,000    
Senior Secured Revolving Facility            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Senior debt   $ 71,323,000     $ 38,720,000  
Maximum borrowing capacity     $ 110,000,000      
Subsequent Event [Member] | Senior Secured Revolving Facility            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Senior debt $ 71,500,000