Annual report pursuant to Section 13 and 15(d)

Revenue (Major Customers) (Details)

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Revenue (Major Customers) (Details) - Revenues - Customer concentration risk - Fidelity
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Major Customers      
Revenue as a percentage of the company's total 15.00% 17.00% 17.00%
Envestnet Wealth Solutions      
Major Customers      
Revenue as a percentage of the company's total 19.00% 21.00% 22.00%