Summary of significant accounting policies - (Details)	2 Months Ended	3 Months Ended			10 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Mar. 31, 2020 USD ($) segment loan	Mar. 31, 2019 USD ($)		Nov. 14, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor	Predecessor	[1]	Predecessor	Predecessor
Number of Reportable Segments | segment		1
Threshold Sweep Account Balance		$ 750,000
Uninsured cash and cash equivalents balance	$ 236,700,000	256,900,000
Restricted cash	$ 0	$ 0
Number of non performing loans | loan	2	1
Impairment of goodwill		$ 0
Estimated Useful Lives of Intangible assets		3 years
Right-of-use asset		$ 400,000
Lease Liability		$ 400,000
Commissions paid to a related party			$ 1,300,000
Provision for income taxes			$ 0
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage Notes Receivable Term		12 months
Estimated Useful Lives of fixed assets		7 years
Contractual Rate		70.00%
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage Notes Receivable Term		5 months
Estimated Useful Lives of fixed assets		3 years
Contractual Rate		50.00%

[1] Predecessor periods are combined as disclosed in Note 1.