Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

v3.19.3
Debt - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2019
USD ($)
Jun. 24, 2013
USD ($)
Installment
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Outstanding borrowings under credit facility     $ 17,100,000   $ 17,100,000    
Interest expense including amortization of deferred financing fees     239,000 $ 7,000 255,000 $ 36,000  
City National Bank              
Debt Instrument [Line Items]              
Credit facility, borrowing capacity   $ 15,000,000          
Interest expense including amortization of deferred financing fees     237,000 $ 7,000 250,000 $ 15,000  
Accrued, unpaid interest         $ 0   $ 0
Delayed Draw Term Loan | City National Bank              
Debt Instrument [Line Items]              
Credit facility, borrowing capacity $ 25,500,000 $ 7,500,000          
Credit facility maturity date Jul. 01, 2026       Jun. 24, 2025    
Credit facility, interest rate description         The higher of the prime rate plus a margin of 0.05 percentage points and 2.5% or (b) the LIBOR rate plus 3 percentage points, at the borrowers' option.    
Increased borrowing capacity under credit facility $ 18,000,000            
Credit facility draw date Jul. 01, 2024            
Variable rate notes issued for redemption of partners' interests, spread   2.75%          
Debt instrument variable interest rate basis         LIBOR    
Credit facility, number of installments | Installment   20          
Credit facility, frequency of installments         Quarterly    
Outstanding borrowings under credit facility     17,100,000   $ 17,100,000   0
Delayed Draw Term Loan | City National Bank | Maximum              
Debt Instrument [Line Items]              
Variable rate notes issued for redemption of partners' interests, spread   0.25%          
Debt instrument variable interest rate basis         Prime rate    
Delayed Draw Term Loan | City National Bank | Minimum              
Debt Instrument [Line Items]              
Credit facility, fixed interest rate   2.50%          
Borrowings Under Revolving Credit Agreement | City National Bank              
Debt Instrument [Line Items]              
Credit facility, borrowing capacity   $ 7,500,000          
Credit facility maturity date         Jun. 21, 2019    
Credit facility extended maturity date         Jun. 19, 2020    
Debt covenant, restriction on change in control   30.00%          
Outstanding borrowings under credit facility     $ 0   $ 0   $ 0