Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

v3.10.0.1
Debt - Additional Information (Detail)
1 Months Ended 12 Months Ended
Jun. 22, 2018
Aug. 01, 2017
USD ($)
Aug. 01, 2016
USD ($)
Aug. 01, 2015
USD ($)
Nov. 01, 2014
USD ($)
Jun. 24, 2013
USD ($)
Installment
Jun. 03, 2013
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2018
USD ($)
Installment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Oct. 31, 2014
USD ($)
Debt Instrument [Line Items]                              
Interest expense including amortization of deferred financing fees                     $ 62,000 $ 112,000 $ 228,000    
Promissory Note                              
Debt Instrument [Line Items]                              
Variable rate notes issued for redemption of partners' interests, spread             1.00%                
Debt instrument variable interest rate basis                     The principal amount outstanding under these notes bore interest at the U.S. Prime Rate plus 1% in effect at the time payments are due.        
Aggregate principal amount             $ 5,300,000                
Debt instrument reduction to principal amount                             $ 1,722,000
Principal amount of notes                     $ 3,578,000        
Principal amount payment terms                     As a result, the principal amounts of the notes of $3,578 were payable in four equal installments of approximately $900 on November 1, 2014, and on each of August 1, 2015, 2016 and 2017.        
Number of installments | Installment                     4        
Installment amount payable   $ 900,000 $ 900,000 $ 900,000 $ 900,000                    
Principal amount of notes outstanding                     $ 0 0      
Accrued, unpaid interest                     $ 0 0      
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 were 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                     $ 0 722,000      
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                            
Borrowings under revolving credit facility                     0 0      
Credit facility, proceeds from borrowings                     0 0      
Credit facility draw date Jun. 25, 2023                            
Interest expense including amortization of deferred financing fees                     $ 21,000 $ 17,000 $ 47,000    
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        
Credit facility extended maturity date                     Jun. 21, 2019        
Debt covenant, restriction on change in control           30.00%