Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information Credit Agreement (Detail)

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Commitments and Contingencies - Additional Information Credit Agreement (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Line of Credit Facility [Line Items]        
Senior secured revolving credit facility maximum borrowing capacity $ 60,000,000.0   $ 60,000,000.0  
Revolving credit facility maturity date     Jun. 01, 2022  
Date the company entered into a credit Agreement     Jun. 18, 2014  
Credit agreement amended and restated date     May 28, 2019  
Credit agreement date     Nov. 27, 2019  
Standby letters of credit borrowing capacity 10,000,000.0   $ 10,000,000.0  
Standby letters of credit, utilized amount 533,000   $ 533,000  
Credit facility interest rate description     The Credit Facility includes a $10.0 million sublimit for the issuance of standby letters of credit of which $533,000 was utilized at September 30, 2021. Borrowings under the Credit Facility will bear interest, at the Company’s option, at either (i) a fluctuating rate per annum 2.00% below the Base Rate (defined as the highest of (a) the Bank’s prime rate, (b) one-month LIBOR plus 1.50%, and (c) the federal funds rate plus 1.50%), or (ii) at a fixed rate per annum determined by Bank to be between 0.875% to 1.125% above LIBOR.  
LIBOR rate duration period     1 month  
Credit agreement, unused capacity, commitment fee percentage     0.10%  
Interest expense 144,000 $ 199,000 $ 436,000 $ 695,000
Credit agreement, amount outstanding 0   $ 0  
Credit facility covenants     (i) an EBITDAR Coverage Ratio (as defined in the Credit Agreement) of not less than 1.25:1.0 as of each quarter end, determined on a rolling four-quarter basis, and (ii) total funded debt to EBITDA not greater than 1.5:1.0 as of each quarter end, determined on a rolling four-quarter basis, and also limits investments in foreign entities and certain other loans.  
Minimum EBITDAR coverage ratio     1.25%  
Maximum Total Funded Debt to EBITDA ratio     1.5:1  
Credit agreement, pledge percentage     100.00%  
Compliance description     As of September 30, 2021, the Company was in compliance with all financial and non-financial covenants and has not experienced any limitation in its operations as a result of the covenants.  
Fluctuating rate per annum     2.00%  
LIBOR [Member]        
Line of Credit Facility [Line Items]        
Base spread on variable rate     1.50%  
Federal Funds Rate [Member]        
Line of Credit Facility [Line Items]        
Base spread on variable rate     1.50%  
Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Credit agreement date     Feb. 09, 2021  
Interest expense 21,000 $ 22,000 $ 65,000 $ 65,000
Credit agreement, amount outstanding $ 0   $ 0  
Minimum [Member] | LIBOR [Member]        
Line of Credit Facility [Line Items]        
Base spread on variable rate     0.875%  
Maximum [Member] | LIBOR [Member]        
Line of Credit Facility [Line Items]        
Base spread on variable rate     1.125%