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Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Detail) - Dec. 31, 2019
zł in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
PLN (zł)
USD ($)
Disclosure of detailed information about borrowings [line items]      
Guarantees limit ₩ 938,929 zł 13,751 $ 76,884
Performance guarantee [member] | Seoul Guarantee Insurance and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 166,315   1,200
Guarantee for import letters of credit [member] | Industrial Bank of Korea and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit | $     5,980
Guarantee for payment in foreign currency [member] | KEB Hana Bank and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit   zł 13,751 59,304
Comprehensive credit line [member] | KEB Hana Bank and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 40,000    
Comprehensive credit line [member] | KEB Hana Bank [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit | $     10,000
Bid guarantee [member] | KEB Hana Bank [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 42,581   $ 400
Performance guarantee/Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 460,871    
Guarantee for advances received/others [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 218,267    
Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 562    
Guarantees for licensing [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 6,578    
Guarantees for deposits [member] | Seoul guarantee insurance [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 3,586    
Merchant business guarantee insurance [member] | Seoul guarantee insurance [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit ₩ 169