Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

v3.19.1
Debt - Additional Information (Detail)
3 Months Ended 12 Months Ended
Jun. 22, 2018
Jun. 24, 2013
USD ($)
Installment
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Interest expense including amortization of deferred financing fees     $ 8,000 $ 16,000  
City National Bank          
Debt Instrument [Line Items]          
Credit facility, borrowing capacity   $ 15,000,000      
Credit facility maturity date Jun. 24, 2025        
Credit facility, proceeds from borrowings     0   $ 0
Credit facility draw date Jun. 25, 2023        
Borrowings under revolving credit facility     0   $ 0
Interest expense including amortization of deferred financing fees     $ 7,000 $ 4,000  
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%