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Commitments and contingencies (Details)
2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2020
state
county
Mar. 31, 2019
[1]
Nov. 14, 2019
Dec. 31, 2018
Concentration Risk [Line Items]          
Financial Designation, Predecessor and Successor [Fixed List] Successor Successor Predecessor Predecessor Predecessor
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract   10 years      
Mortgage notes receivables | Geographic concentration risk          
Concentration Risk [Line Items]          
Number of states in mortgage loans were originated | state   13      
Number of counties in which loan portfolio concentrated | county   10      
Concentration risk percentage   50.60%      
[1] Predecessor periods are combined as disclosed in Note 1.