Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Deferred Revenues: Market Access Fees from Sports Wagering Agreements (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Deferred Revenues: Market Access Fees from Sports Wagering Agreements (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Apr. 01, 2021
Dec. 31, 2020
Dec. 22, 2020
Dec. 31, 2019
Basis Of Presentation [Line Items]          
Deferred revenues $ 6,170   $ 6,770    
Liabilities in other accrued expenses 600   $ 800    
Bronco Billy's And Rising Star Casino Resort [Member]          
Basis Of Presentation [Line Items]          
Deferred revenues $ 2,000        
Rising Star Casino Resort          
Basis Of Presentation [Line Items]          
Deferred revenues   $ 1,000      
Bronco Billy's Casino and Hotel          
Basis Of Presentation [Line Items]          
Deferred revenues       $ 1,000  
Sports Wagering Agreements          
Basis Of Presentation [Line Items]          
Deferred revenues         $ 6,000