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General Information - Schedule of Consolidated Financial Information Subsidiaries (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets | ₩ 265,372 | ₩ 175,425 |
Total liabilities | 88,024 | 59,659 |
Revenue | 405,953 | 360,967 | ₩ 286,770
Profit (loss) for the year | 62,556 | 39,730 | ₩ 31,386
Gravity Interactive, Inc. |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets | 31,849 | 39,296 |
Total liabilities | 23,405 | 29,112 |
Revenue | 123,055 | 230,029 |
Profit (loss) for the year | 1,138 | 12,804 |
Gravity Entertainment Corporation |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets |  | 44 |
Total liabilities |  | 52 |
Revenue |  | 263 |
Profit (loss) for the year | 8 | (443) |
Gravity NeoCyon, Inc. (Formerly, NeoCyon, Inc.) |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets | 11,069 | 9,145 |
Total liabilities | 7,422 | 6,728 |
Revenue | 26,368 | 25,347 |
Profit (loss) for the year | (1,754) | (982) |
Gravity Communications Co.,Ltd. |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets | 33,717 | 19,964 |
Total liabilities | 10,070 | 8,227 |
Revenue | 41,677 | 21,811 |
Profit (loss) for the year | 12,281 | 5,637 |
PT. Gravity Game Link |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets | 2,185 | 960 |
Total liabilities | 664 | 202 |
Revenue | 4,881 | 745 |
Profit (loss) for the year | (315) | (437) |
Gravity Game Tech Co.,Ltd. |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets | 21,093 | 4,008 |
Total liabilities | 6,315 | 2,624 |
Revenue | 39,147 | 2,295 |
Profit (loss) for the year | 13,989 | (1,973) |
Gravity Game Arise Co., Ltd. |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |
Total assets | 2,637 | 1,841 |
Total liabilities | 2,066 | 1,343 |
Revenue | 2,483 | 771 |
Profit (loss) for the year | ₩ 82 | ₩ (35) |

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