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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Deferred Revenues (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred revenue, current | $ 1,222 | $ 1,372 |
Deferred revenue, net of current portion | 4,948 | 5,398 |
Contract with Customer, Liability, Total | $ 6,170 | $ 6,770 |
Sports Wagering Agreements |  |  |
Contract with Customer, Liability, Total |  |  | $ 6,000

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