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Commitments and Contingent Liabilities - Additional Information (Details)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
KRW (₩)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
KRW (₩)
Disclosure Of Contingent Liabilities [Line Items]      
Right to develop and distribute games period 5 years    
Purchase obligations | ₩ ₩ 3,310   ₩ 868
Kookmin Bank      
Disclosure Of Contingent Liabilities [Line Items]      
Payment guarantees receivable | $   $ 912,000  
Bottom of Range      
Disclosure Of Contingent Liabilities [Line Items]      
Percentage of commitments 20.00%    
Top of Range      
Disclosure Of Contingent Liabilities [Line Items]      
Percentage of commitments 40.00%