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Summary of Significant Accounting Policies - Contract Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Outstanding Chip Liability    
Movement in Contract with Customer, Liability [Roll Forward]    
Balance at January 1 $ 756 $ 1,763
Balance at December 31 997 756
Increase (decrease) 241 (1,007)
Loyalty Program    
Movement in Contract with Customer, Liability [Roll Forward]    
Balance at January 1 4,696 6,214
Balance at December 31 3,969 4,696
Increase (decrease) (727) (1,518)
Customer Deposits and Other    
Movement in Contract with Customer, Liability [Roll Forward]    
Balance at January 1 5,015 6,126
Balance at December 31 3,497 5,015
Increase (decrease) $ (1,518) $ (1,111)