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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Related party transactions (Details) - USD ($)	12 Months Ended
Related party transactions (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lennar \| Settlement of TSA Services Arrangement \| Affiliated Entity
Related Party Transactions (Details) [Line Items]
Expenses from transactions with related party		$ 300,000	$ 3,900,000
Revenue from related parties			2,500,000
Lennar \| Rent associated with shared spaces \| Affiliated Entity
Related Party Transactions (Details) [Line Items]
Expenses from transactions with related party	$ 100,000	200,000	$ 200,000
Keystone Strategy, LLC \| Consulting Agreement \| Affiliated Entity
Related Party Transactions (Details) [Line Items]
Expenses from transactions with related party	300,000	$ 0
Accounts payable, related parties	$ 0
Doma Holding, Inc \| Lennar
Related Party Transactions (Details) [Line Items]
Converted shares, percentage	25.40%