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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Parenthetical) (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | Jun. 09, 2021 | Mar. 08, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Aug. 13, 2020 | Jun. 16, 2020 | May 04, 2020
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Fair value of convertible notes |  |  | $ 170,191 |  | $ 24,344 | $ 145,847 |
Securrency - Series A convertible preferred stock |  |  |  |  |  |  |
Fair value of convertible notes | $ 8,488 | $ 8,349 |  |  |  |  |
Advisor Engine [Member] |  |  |  |  |  |  |
Fair value of financial interest disposed off |  |  |  |  |  |  | $ 9,592
Thesys Group, Inc [Member] |  |  |  |  |  |  |
Fair value of financial interest disposed off |  |  |  | $ 0 |  |  |

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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