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Description of Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions, ₩ in Billions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 25, 2020 USD ($) | Feb. 25, 2020 KRW (₩) | Mar. 31, 2021 Segment | Dec. 31, 2020 Segment | Dec. 31, 2017 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Business combination consideration transferred | $ |  |  |  |  | $ 825.0
Number of operating segments | Segment |  |  | 1 | 1 |
Double8 Games Co., Ltd.[Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Business combination consideration transferred | $ 1.9 | ₩ 2.3 |  |  |
DoubleU Games Co., Ltd.[Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Equity interest percentage |  |  | 67.70% | 67.70% |
STIC Special Situation Private Equity Fund [Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Minority interest ownership percentage |  |  | 32.30% | 32.30% |

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