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Commitments and Contingencies (Details) - USD ($)
Oct. 05, 2018
Dec. 31, 2020
Revolving Credit Facility | Unsecured debt    
Loss Contingencies    
Letters of credit outstanding   $ 3,400,000
Real Estate Technology Venture Capital Fund    
Loss Contingencies    
Commitment to fund amount $ 20,000,000.0  
Contributions to date   4,200,000
Amount remaining to be contributed   $ 15,800,000