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Property and Equipment - Summary of Classification of Depreciation Expenses in Statements of Comprehensive Income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Property Plant And Equipment [Line Items]      
Depreciation of property,plant and equipment ₩ 3,783 ₩ 2,748 ₩ 545
Cost of Revenues      
Disclosure Of Property Plant And Equipment [Line Items]      
Depreciation of property,plant and equipment 2,123 1,795 260
Selling, General and Administrative Expenses      
Disclosure Of Property Plant And Equipment [Line Items]      
Depreciation of property,plant and equipment 1,424 761 233
Research and Development      
Disclosure Of Property Plant And Equipment [Line Items]      
Depreciation of property,plant and equipment ₩ 236 ₩ 192 ₩ 52