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Investment - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Dec. 27, 2019
Jun. 20, 2017
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment [Line Items]          
Carrying value of investments     $ 11,192 $ 11,192  
Carrying Value of AdvisorEngine Preferred Stock     $ 0    
Advisor Engine [Member]          
Investment [Line Items]          
Ownership interest percentage     46.00%    
Original fully diluted ownership interest percentage     41.00%    
Carrying Value of AdvisorEngine Preferred Stock     $ 0    
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    
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  
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]          
Ownership interest percentage     25.00%    
Original fully diluted ownership interest percentage     20.00%    
Percentage of voting approval required to redeem all of the outstanding Series A preferred     60.00%    
Securrency Inc [Member] | Convertible Preferred Stock [Member]          
Investment [Line Items]          
Carrying value of investments $ 8,112   $ 8,112 $ 8,112  
Number of shares purchased 5,178,488        
Non-cumulative dividend 6.00%