Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Unamortized discounts, fees, and costs	$ (6,398)	$ (222)
Reserve for loan losses	(4,198)	(10,280)	$ 0
Loans receivable, net	429,076	195,375
Remaining loans receivable commitments	61,000	11,000
Secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	416,729	161,530
Mezzanine and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	$ 22,943	$ 44,347