Profits interest incentive plan - Schedule of Profit Interest Liability Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Balance at December 31, 2019	$ 8,592,000
Decrease in fair value of vested liability (Pre-Corporate Reorganization) recognized as decrease to stock-based compensation expense	(7,601,000)
Fair value of vested liability assumed additional paid in capital	(991,000)
Balance at December 31, 2020	$ 0