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Investment, Carried at Cost - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 20, 2017 | Sep. 30, 2019 | Dec. 31, 2018
Investment [Line Items] |  |  |
Carrying value of investment |  | $ 28,080 | $ 28,080
AdvisorEngine [Member] |  |  |
Investment [Line Items] |  |  |
Ownership interest percentage |  | 46.00% |
Original fully diluted ownership interest percentage |  | 41.00% |
AdvisorEngine [Member] | Convertible Preferred Stock [Member] |  |  |
Investment [Line Items] |  |  |
Carrying value of investment |  | $ 25,000 | 25,000
AdvisorEngine [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% |
AdvisorEngine [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 investment |  | $ 3,080 | $ 3,080
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% |  |

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