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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

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