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Investment - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 27, 2019 | Jun. 20, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment [Line Items] |  |  |  |  |
Carrying value of investments |  |  | $ 11,192 | $ 28,080 |
Series A Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Percentage of voting approval required to redeem all of the outstanding Series A preferred |  |  | 60.00% |  |
Advisor Engine [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership interest percentage |  |  | 46.00% |  |
Original fully diluted ownership interest percentage |  |  | 41.00% |  |
Impairment on AdvisorEngine Preferred Stock |  |  | $ 25,000 |  |
Advisor Engine [Member] | Convertible Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying value of investments |  |  |  | 25,000 |
Advisor Engine [Member] | Convertible Preferred Stock [Member] | Series A Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Number of shares purchased |  |  | 11,811,856 |  |
Non-cumulative dividend |  |  | 6.00% |  |
Advisor Engine [Member] | Convertible Preferred Stock [Member] | Series A- One Convertible Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Number of shares purchased |  |  | 2,646,062 |  |
Thesys Group, Inc [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying value of investments |  |  | $ 3,080 | 3,080 |
Impairment on Thesys preferred stock |  |  | $ 0 | $ 3,829 |
Thesys Group, Inc [Member] | Series Y Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Gain loss on settlements with related party |  |  |  |  | $ 6,909
Thesys Group, Inc [Member] | Convertible Preferred Stock [Member] | Series Y Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Number of shares issued |  | 7,797,533 |  |  |
Current fully diluted ownership percentage |  | 19.00% |  |  |
Liquidation preference |  | $ 0.231 |  |  |
Thesys Group, Inc [Member] | Warrant [Member] | Series Y Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Warrants to purchase shares |  | 3,898,766 |  |  |
Exercisable percentage of warrant if claim brought against Company |  | 100.00% |  |  |
Securrency Inc [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Date of agreement |  |  | Dec. 27, 2019 |  |
Ownership interest percentage |  |  | 25.00% |  |
Original fully diluted ownership interest percentage |  |  | 20.00% |  |
Securrency Inc [Member] | Convertible Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying value of investments | $ 8,112 |  | $ 8,112 |  |
Securrency Inc [Member] | Convertible Preferred Stock [Member] | Series A Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Number of shares purchased | 5,178,488 |  |  |  |
Non-cumulative dividend | 6.00% |  |  |  |

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