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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details)

v3.21.2
REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details) - OLD PlayStudios, Inc. - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Disaggregation of Revenue [Line Items]      
Contract receivables, included in Receivables $ 16,616,000 $ 14,249,000  
Contract assets 0 0  
Deferred revenue 20,000,000    
Virtual currency      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 0 $ 0 $ 0