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Significant Accounting Policies - Additional Information (Detail) ₩ / shares in Units, $ / shares in Units, ₩ in Billions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 15, 2020 shares | May 31, 2017 USD ($) $ / shares shares | Mar. 31, 2021 Segment | Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 31, 2017 KRW (₩) ₩ / shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Impairment of indefinite-lived intangible assets |  |  |  | $ 0 |  |  |
Impairment of goodwill |  |  |  | 0 |  |  |
Defined benefit plan, benefit obligation |  |  |  | 2,792,000 | $ 1,882,000 | $ 1,245,000 |
Defined contribution expense |  |  |  | 467,000 | 394,000 |  |
Deferred offering costs |  |  |  |  | 1,300,000 |  |
Advertising Expense |  |  |  | $ 61,800,000 | 28,500,000 |  |
Number of operating segments | Segment |  |  | 1 | 1 |  |  |
2.5% Convertible bonds due 2024 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  | $ 193,000,000 |  |  |  |  | ₩ 210
Debt instrument, interest rate, stated percentage |  | 2.50% |  |  |  |  | 2.50%
Debt conversion shares issued | shares | 715,258 |  |  |  |  |  |
2.5% Non convertible bonds due 2024 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  | $ 83,000,000 |  |  |  |  | ₩ 90
Debt instrument, interest rate, stated percentage |  | 2.50% |  |  |  |  | 2.50%
Debt conversion shares issued | shares | 306,539 | 306,540 |  |  |  |  |
Debt conversion shares issued price per share | (per share) |  | $ 270 |  |  |  |  | ₩ 293,600
Other net [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Deferred offering costs |  |  |  | $ 5,400,000 |  |  |
Employee contributions percentage one [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Defined contribution plan matching contribution percent |  |  |  | 1.00% |  |  |
Employee contributions percentage two [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Defined contribution plan matching contribution percent |  |  |  | 5.00% |  |  |
On the one percentage of employee contributions [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Defined contribution plan matching contribution percent of match |  |  |  | 100.00% |  |  |
On the next five percentage of employee contributions [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Defined contribution plan matching contribution percent of match |  |  |  | 50.00% |  |  |
Other non-current liabilities [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Defined benefit plan, benefit obligation |  |  |  | $ 2,800,000 | $ 1,900,000 |  |

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