Fair value measurements - Additional Information (Details) shares in Millions, $ in Millions	2 Months Ended	3 Months Ended			10 Months Ended	12 Months Ended
	Dec. 31, 2019 shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019	[1]	Nov. 14, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor	Predecessor		Predecessor	Predecessor
Warrants outstanding (in shares) | shares	41.7	41.7
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of mortgage notes receivable		5 months
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of mortgage notes receivable		12 months
Farallon PIPE Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants outstanding (in shares) | shares	7.2	7.2
Recurring | Trinity Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Value of shares issued | $		$ 75.0
Recurring | Farallon PIPE Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants outstanding (in shares) | shares		7.2
Purchase of additional shares of common stock | $		$ 25.0
Recurring | Other expense | Farallon PIPE Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in warrant liability | $		$ 4.6
Non recurring | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of discounts to appraisals		0.00%
Percentage of discounts to appraisals for mortgage notes receivable		0
Non recurring | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of discounts to appraisals		10.00%
Percentage of discounts to appraisals for mortgage notes receivable		10

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