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Leases - Additional Information (Detail) ft² in Thousands, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Jul. 01, 2012 ft² | Mar. 31, 2021 USD ($) ft² | Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Operating Lease, Right-of-Use Asset |  |  | $ 9,155 | $ 9,987 | $ 12,384 |
Operating Lease, Liability |  |  | $ 9,974 | 10,864 | 13,219 |
Area of Land | ft² |  | 49,375 |  |  |  |
Operating lease costs |  |  |  | 3,200 | $ 3,100 |
Minimum [Member] |  |  |  |  |  |
Operating lease, remaining lease term |  |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |  |
Operating lease, remaining lease term |  |  | 5 years |  |  |
Seattle [Member] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | $ 9,200
Operating Lease, Liability |  |  |  |  |  | $ 9,400
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 4.97%
Lessee, Operating Lease, Renewal Term | 61 months |  |  |  |  |
Lessee Operating Lease Expired Term | 2024-10 | 2024-10 |  |  |  |
Gangnamgu [Member] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | 5,600 |  |
Operating Lease, Liability |  |  |  | $ 5,600 |  |
Debt instrument, interest rate, stated percentage |  |  |  | 6.07% |  |
Area of Land | ft² |  |  | 21,218 | 31,636 |  |
Lessee Operating Sub Lease Expired Term |  |  | 2023-09 | 2023-09 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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