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v3.20.4

Leases - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($)
Square feet of office space | ft² | 86,000 |  |  |
Average initial lease term | 4 years |  |  |
Lease liability | $ 3,404 | $ 4,717 |  | $ 5,700
Discount rate | 5.30% |  |  |
Operating leases, rent expense, net | $ 1,600 | 1,600 | $ 1,400 |
Total lease payments | 1,700 | 1,600 | 1,300 |
Lease obligation incurred | $ 200 | $ 500 | $ 800 |
Minimum [Member] |  |  |  |
Lease term range | 1 year |  |  |
Maximum [Member] |  |  |  |
Lease term range | 3 years 9 months 18 days |  |  |
Weighted Average [Member] |  |  |  |
Lease term range | 1 year 4 months 24 days |  |  |

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- Definition Amount of increase in lease obligation from new lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 2: 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 + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Term of lessee's 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)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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