Related Party Transactions - Other Related Party Transactions (Details) - USD ($)		1 Months Ended
	Nov. 30, 2020	Feb. 28, 2019
Cantor Fitzgerald Limited Partnership And B G C Partners Incorporation | Government Sponsored Enterprise Loans
Related Party Transaction
Maximum amount per loan		$ 100,000,000
Limit on loans that have not yet been acquired or sold		250,000,000
Limit on loans outstanding		$ 250,000,000
Sale Of Products And Services | Affiliated Persons or Entities | View, Inc.
Related Party Transaction
Related party transaction, term of agreement	5 years