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AdvisorEngine Inc. - Sale of Financial Interests - Summary of carrying value of the Company's financial interests (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Total net carrying value $ 0 $ 28,172
Advisor Engine [Member]    
Unsecured convertible note, Amortized Cost plus Accrued Interest 0 2,126
Unsecured non-convertible note, Amortized Cost, plus Accrued Interest 0 31,184
Subtotal—Notes receivable, Amortized Cost, plus Accured Interest 0 33,310
Preferred stock, Amortized Cost, plus Accrued Interest 0 25,000
Total amortized cost, plus accrued interest 0 58,310
Unsecured convertible note, Net Carrying Value 0 2,126
Unsecured non-convertible note, Net Carrying Value 0 26,046
Subtotal—Notes receivable, Net Carrying Value 0 28,172
Preferred stock, Net Carrying Value 0  
Total net carrying value $ 0 $ 28,172