Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

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Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 22, 2018
Jun. 24, 2013
USD ($)
Installment
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Installment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2015
USD ($)
Debt Instrument [Line Items]                      
Interest expense including amortization of deferred financing fees           $ 7,000 $ 17,000 $ 36,000 $ 85,000    
Promissory Note | Jamison                      
Debt Instrument [Line Items]                      
Variable rate notes issued for redemption of partners' interests, spread               5.00%      
Debt instrument variable interest rate basis               The principal amount outstanding under the notes bears interest at 5% per annum.      
Aggregate principal amount                     $ 2,165,000
Principal amount payment terms               The principal amounts of the notes are payable in three equal installments of approximately $722 on each of June 30, 2016, 2017 and 2018.      
Number of installments | Installment               3      
Installment amount payable     $ 722,000 $ 722,000 $ 722,000            
Principal amount of notes outstanding           0   $ 0   $ 722,000  
Accrued, unpaid interest               0   18,000  
City National Bank                      
Debt Instrument [Line Items]                      
Credit facility, borrowing capacity   $ 15,000,000                  
Credit facility maturity date Jun. 24, 2025                    
Credit facility draw date Jun. 25, 2023                    
Credit facility, proceeds from borrowings               0   0  
Borrowings under revolving credit facility           0   0   $ 0  
Interest expense including amortization of deferred financing fees           $ 7,000 $ 4,000 $ 15,000 $ 12,000    
Delayed Draw Term Loan | City National Bank                      
Debt Instrument [Line Items]                      
Credit facility, borrowing capacity   $ 7,500,000                  
Credit facility maturity date               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.      
Variable rate notes issued for redemption of partners' interests, spread   3.00%                  
Debt instrument variable interest rate basis               LIBOR      
Credit facility, number of installments | Installment   20                  
Credit facility, frequency of installments               Quarterly      
Delayed Draw Term Loan | City National Bank | Maximum                      
Debt Instrument [Line Items]                      
Variable rate notes issued for redemption of partners' interests, spread   0.05%                  
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               Dec. 21, 2018      
Debt covenant, restriction on change in control   30.00%