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v3.21.2

Debt - Additional Information (Detail) ₩ / shares in Units, $ / shares in Units, $ in Thousands, ₩ in Billions |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2020 USD ($) shares | May 15, 2020 KRW (₩) shares | Aug. 01, 2019 | Sep. 30, 2020 USD ($) | Sep. 30, 2020 KRW (₩) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 KRW (₩) | Aug. 31, 2019 USD ($) | Aug. 31, 2019 KRW (₩) | May 31, 2019 USD ($) | May 31, 2019 KRW (₩) | Jun. 30, 2020 USD ($) shares | Mar. 31, 2021 | Dec. 31, 2020 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2020 ₩ / shares | Jan. 01, 2020 USD ($) | Jan. 01, 2020 KRW (₩) | May 31, 2019 KRW (₩) | Dec. 31, 2017 KRW (₩) ₩ / shares shares | May 31, 2017 USD ($) shares | May 31, 2017 KRW (₩) ₩ / shares shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of related party debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,371 |  |  |  |  |  |  |  |
Debt instrument converted into equity amount stock value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 187,095 |  |  |  |  |  |  |  |
Stic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Internal rate of return percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |
Percentage of shares issuable in initial public offer |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  | 50.00% |  |
2.5% Convertible bonds due 2024 [Member] | Stic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 185,000 |  |  |  |  | ₩ 210.0 |  |
Convertible bonds long term rate of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  | 2.50% |  |
Debt instrument year of maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |
Debt instrument conversion price per share | ₩ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₩ 293,600 |  |  |  | ₩ 293,600 |  |
Debt instrument number of shares issuable on conversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 715,258 |  |  |  |  |  |  |
Debt instrument shares issued on conversion | shares |  |  |  |  |  |  |  |  |  |  |  | 715,258 |  |  |  |  |  |  |  |  |  |
Coupon interest payable |  |  |  |  |  | $ 900 |  |  |  |  |  | $ 900 |  |  |  |  |  |  |  |  |  |
Coupon yield to maturity return |  |  |  |  |  | 4,500 |  |  |  |  |  | $ 4,500 |  |  |  |  |  |  |  |  |  |
Debt instrument converted into equity amount | $ 187,100 | ₩ 229.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument converted into equity amount stock value | 5,800 | 7.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument converted into equity amount recorded in additional paid in capital | 181,300 | 222.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.5% Convertible bonds due 2024 [Member] | Stic [Member] | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 193,000 |  |  |  |  |  |  |
2.5% Non convertible bonds due 2024 [Member] | Stic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 79,000 |  |  |  |  | ₩ 90.0 | $ 83,000 | ₩ 90.0
Convertible bonds long term rate of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  | 2.50% |  |
Debt instrument year of maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |
Class of warrants or rights number of shares covered by the warrants or rights | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 306,540 |  |  |  |  | 306,540 | 306,539 | 306,539
Class of warrants or rights conversion price per share | (per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 270 |  |  |  |  | ₩ 293,600 |  | ₩ 293,600
Long term debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 26, 2024 |  |  |  |  | May 26, 2024 |  |
Coupon interest payable quarterly percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 0.625% |  |  |  |  |  |  |
Coupon yield to maturity return percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
Long term debt default rate of interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |
Debt instrument converted into equity amount | 64,400 | 79.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument converted into equity amount stock value | 2,500 | 3.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument converted into equity amount recorded in additional paid in capital | $ 61,900 | ₩ 75.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants of rights the date from which the rights are excercisable |  |  |  |  |  |  |  |  |  |  |  |  |  | May 25, 2018 |  |  |  |  |  |  |  |
Class of warrants or rights maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 26, 2024 |  |  |  |  |  |
Stock shares issued during the period warrant excercises | shares | 306,539 | 306,539 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of accrued coupon interest | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forefeiture of unpaid yield to maturity interest | $ 1,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.5% Non convertible bonds due 2024 [Member] | Stic [Member] | Possible Premature Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 26, 2022 |  |  |  |  | May 26, 2022 |  |
2.5% Non convertible bonds due 2024 [Member] | Stic [Member] | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 83,000 |  |  |  |  |  |  |
Class of warrants or rights number of shares covered by the warrants or rights | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 306,539 |  |  |  |  | 306,539 |  |
3.5% senior notes due in 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  | $ 74,000 |  |  |  |  |  |  |  |  | ₩ 80.0 |  |  |
Convertible bonds long term rate of interest |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  | 3.50% |  |  |
Debt instrument year of maturity |  |  | 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument periodic payment principal |  |  |  |  |  |  |  | $ 18,000 | ₩ 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument terms of interest payment |  |  | Quarterly interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.3% senior note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible bonds long term rate of interest |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |  | 4.30% |  |  |
Proceeds from senior notes |  |  |  |  |  |  |  |  |  | $ 18,000 | ₩ 20.0 |  |  |  |  |  |  |  |  |  |  |
4.6% senior notes due to related parties in 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 92,000 | ₩ 100.0 |  |  |  |
Related party transaction rate of interest |  |  |  |  |  |  |  |  |  |  |  |  | 4.60% | 4.60% |  |  |  |  |  |  |  |
Long term debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 27, 2024 | May 27, 2024 |  |  |  |
4.6% senior notes due to related parties in 2024 [Member] | Principal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of related party debt |  |  |  | $ 18,000 | ₩ 20.0 | 28,000 | ₩ 30.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.6% senior notes due to related parties in 2024 [Member] | Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of related party debt |  |  |  | $ 1,000 | ₩ 1.2 | $ 2,600 | ₩ 3.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition Maturity date of long-term debt, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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