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Note Receivables - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 11, 2019
Apr. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Interest rate     5.00%   5.00%    
Percentage of interest rate increase at the event of default         10.00%    
Unsecured non-convertible note maturity date         Dec. 29, 2021    
Interest income recognized     $ 628 $ 421 $ 1,223 $ 840  
Funding of AdvisorEngine Notes Receivable         $ 1,540 $ 5,000  
Unsecured Non-Convertible Note bears interest rate     5.00%   5.00%    
Fair Value, Inputs, Level 2 [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Fair value of unsecured non-convertible note receivable     $ 29,703   $ 29,703   $ 27,618
Unsecured Convertible Note [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Interest rate 3.00%            
Funding of AdvisorEngine Notes Receivable   $ 1,540          
Unsecured Non-Convertible Note bears interest rate 3.00%            
Qualified Financing [Member] | Unsecured Convertible Note [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument, convertible, terms of conversion feature at a price per share equal to 80% of the price per share sold in such transaction.            
Non Qualified Non Corporate [Member] | Unsecured Convertible Note [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument, convertible, terms of conversion feature convertible note is repaid at a rate of 1.25 times the outstanding principal amount, plus accrued and unpaid interest            
Corporate Transaction [Member] | Unsecured Convertible Note [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument, convertible, terms of conversion feature convertible note would be repaid in cash from the proceeds of such transaction in the amount of 1.5 times the outstanding principal amount, plus any accrued and unpaid interest