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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 item | Dec. 31, 2019 USD ($) item | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($)
Basis Of Presentation [Line Items] |  |  |  |  |
Deferred revenues |  | $ 5,985,000 |  | $ 6,770,000 | $ 5,985,000
Advertising costs included in selling, general and administrative expenses |  |  |  | 2,200,000 | 4,200,000
Project development cost |  |  |  | 250,000 |
Customer Loyalty Programs |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Liabilities Based On Standalone Retail Value Included In Other Accrued Expenses |  | 1,400,000 |  |  | 1,400,000
Players Club Points [Member] |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Liabilities Based On Standalone Retail Value Included In Other Accrued Expenses |  | $ 1,400,000 |  | $ 800,000 | $ 1,400,000
Sports Wagering Agreements |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Deferred revenues |  |  | $ 6,000,000 |  |
Revenue recognition term |  |  | 10 years |  |
Sports Wagering Agreements | INDIANA |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of contracted mobile sports operators in operations | item |  | 1 |  |  |
Number of contracted mobile sports operators expected to begin | item |  |  |  | 2 |
Sports Wagering Agreements | COLORADO |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of contracted mobile sports operators in operations | item | 1 |  |  |  |
Number of contracted mobile sports operators | item |  |  |  | 3 |
Collaborative Arrangement, Cash Received |  |  |  | $ 1,000,000 |

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