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Cash Collateral Pledge (Tables)
9 Months Ended
Sep. 30, 2021
Cash and Cash Equivalents [Abstract]  
Schedule of Cash Collateral Pledged
As of September 30, 2021, the Company has the following irrevocable letters of credit, related to leased office space, for which there is cash collateral pledged, which the Company pays a fee on the stated amount of the letter of credit.
LocationAmountMaturity
 (dollars in thousands)
New York$208 April 2022
New York$1,325 October 2022
New York$1,253 November 2021
Boston$194 March 2028
San Francisco$459 October 2025
$3,439