Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) state item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2021 USD ($)	Dec. 19, 2019 USD ($)	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reinsurer | item	5
Percentage of insurance subsidiary's total insurance receivables	68.00%
Minimum cash balance required by lender		$ 3,000
Indemnification hold back cost	$ 2,600
Restricted funds held for payment of possible warranty claims	$ 5,900
Number of states regulatory guidelines of warranty claims | state	25
Customer deposits	$ 300
Term of American home protect warranty contracts	3 years
Loan proceeds related to the Paycheck Protection Program Loan		8,400
Allowance for uncollectible receivables	$ 400	500
Deferred policy acquisition costs	33,014
Accumulated deficit	(424,112)	(317,506)
Losses due to impairment of long-lived assets	600	600	$ 1,100
Principal Amount of debt					$ 3,000
Interest rate (stated)					3.00%
Advertising costs	$ 3,600	$ 2,200	$ 3,700
Effective income tax rate	8.80%	3.00%	(0.10%)
U.S. federal statutory tax rate	21.00%
Right of use asset	$ 4,504
Lease liabilities	4,651
Convertible senior notes, due 2026
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal Amount of debt				$ 425,000
Interest rate (stated)				0.75%
Selling and marketing
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized Contract Cost, amortization	100
Other Noncurrent Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Indemnification hold back cost	500
Capitalized Contract Cost, net	400
Prepaid Expenses and Other Current Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized Contract Cost, net	$ 400
Revenue Benchmark | Customer Concentration Risk | Customers in Texas
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance related revenues percentage	61.00%
ASU 2016 02 | Impacts of adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use asset	$ 1,300
Lease liabilities	$ 1,400
ASU 2016 02 | Cumulative effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit						$ 500