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Summary of Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investments In Loans [Line Items] |  |
Intangibles assets | $ 51,090 | $ 52,536
Intellectual Property [Member] |  |
Investments In Loans [Line Items] |  |
Intangibles assets | 18,974 | 20,075
Contractor Relationships [Member] |  |
Investments In Loans [Line Items] |  |
Intangibles assets | 5,951 | 6,296
Race Organization [Member] |  |
Investments In Loans [Line Items] |  |
Intangibles assets | $ 26,165 | $ 26,165

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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