Quarterly report pursuant to Section 13 or 15(d)

RELATED-PARTY TRANSACTIONS - Summary of Balance Sheet Assets and Liabilities from Related Parties (Details)

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RELATED-PARTY TRANSACTIONS - Summary of Balance Sheet Assets and Liabilities from Related Parties (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]    
Intangibles, net $ 1,400 $ 1,624
MGM | Marketing Agreement    
Related Party Transaction [Line Items]    
Intangibles, net $ 1,000 1,000
Accrued liabilities   $ 20,000