Annual report pursuant to Section 13 and 15(d)

Revenues and Cost of Revenues (Major Customers) (Details)

v3.20.4
Revenues and Cost of Revenues (Major Customers) (Details) - Revenues - Customer concentration risk - Fidelity
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major Customers      
Revenue as a percentage of the company's total 15.00% 15.00% 17.00%
Envestnet Wealth Solutions      
Major Customers      
Revenue as a percentage of the company's total 18.00% 19.00% 21.00%