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REVENUE FROM CONTRACTS WITH CUSTOMERS - Concentration of Credit Risk (Details)

v3.21.2
REVENUE FROM CONTRACTS WITH CUSTOMERS - Concentration of Credit Risk (Details) - OLD PlayStudios, Inc.
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]      
Additional counterparties risk percentage   10.00% 10.00%
Trade receivables | Apple, Inc | Customer concentration      
Concentration Risk [Line Items]      
Concentration risk 60.60% 48.90% 46.00%
Trade receivables | Google, Inc | Customer concentration      
Concentration Risk [Line Items]      
Concentration risk 32.40% 42.70% 43.00%