Income Taxes - Narrative (Details) - USD ($)		12 Months Ended
	Mar. 31, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		$ (132,565,000)	$ 17,967,000	$ (24,264,000)
Operating loss unavailable for carryforward	$ 1,506,000
Net loss		(109,613,000)	(18,527,000)	(80,805,000)
Income tax benefit		$ (6,107,000)	$ 0	$ 0
U.S. federal income tax at statutory rate		21.00%	21.00%	21.00%
State taxes (net of federal benefit)		9.06%	25.23%	4.71%
Effective state income tax rate		0.00%
Unrecognized tax benefits that would impact effective tax rate		$ 0	$ 0
Unrecognized tax benefits		4,692,000	3,105,000	$ 2,159,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		0	0
Unrecognized tax benefits, income tax penalties and interest accrued		0
RentPath Holdings, Inc.
Operating Loss Carryforwards [Line Items]
Income tax benefit		(6,107,000)	0	0
Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward		18,828,000	12,422,000
Research and development credits, decrease	$ 32,000
Federal
Operating Loss Carryforwards [Line Items]
Increase (decrease) in operating loss carryforwards		320,123,000
Federal deductible		149,710	867
Net loss		(114,262,000)	(17,582,000)	(79,518,000)
Foreign
Operating Loss Carryforwards [Line Items]
Net loss		$ (1,458,000)	$ (945,000)	$ (1,287,000)