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Intangible Assets - Summary of Classification of Amortization in Statements of Comprehensive Income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Intangible Assets [Line Items]      
Amortization ₩ 1,137 ₩ 905 ₩ 868
Cost of Revenues      
Disclosure Of Intangible Assets [Line Items]      
Amortization 479 101 251
Selling, General and Administrative Expenses      
Disclosure Of Intangible Assets [Line Items]      
Amortization 597 745 581
Research and Development      
Disclosure Of Intangible Assets [Line Items]      
Amortization ₩ 61 ₩ 59 ₩ 36