Financial Instruments - Schedule of Assets, Liabilities, and Equity Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Short-term investments	$ 110,316	$ 33,737
Mortgage servicing rights, at fair value	36,914	0
Fair Value, Measurements, Recurring
Assets
Cash equivalents	294,396	509,971
Short-term investments	110,316	33,737
Loans held for sale	256,339	35,759
Other current assets	18,917	1,329
Mortgage servicing rights, at fair value	36,914
Long-term Investments	41,677	54,828
Total assets	758,559	635,624
Liabilities
Total liabilities	4,979	153
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash equivalents	294,396	509,971
Short-term investments	110,316
Loans held for sale	0	0
Other current assets	0	0
Mortgage servicing rights, at fair value	0
Total assets	446,389	598,536
Liabilities
Total liabilities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Cash equivalents	0	0
Short-term investments	0
Loans held for sale	256,339	35,759
Other current assets	13,153	138
Mortgage servicing rights, at fair value	0
Total assets	269,492	35,897
Liabilities
Total liabilities	263	93
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	0	0
Short-term investments	0
Loans held for sale	0	0
Other current assets	5,764	1,191
Mortgage servicing rights, at fair value	36,914
Total assets	42,678	1,191
Liabilities
Total liabilities	4,716	60
Fair Value, Measurements, Recurring | Money market funds
Assets
Cash equivalents	294,396	509,971
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash equivalents	294,396	509,971
Fair Value, Measurements, Recurring | Money market funds | Significant Other Observable Inputs (Level 2)
Assets
Cash equivalents	0	0
Fair Value, Measurements, Recurring | Money market funds | Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	0	0
U.S. treasury securities | Fair Value, Measurements, Recurring
Assets
Short-term investments	87,313	16,718
Long-term Investments	41,677	54,828
U.S. treasury securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Short-term investments	87,313	16,718
Long-term Investments	41,677	54,828
U.S. treasury securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Short-term investments	0	0
Long-term Investments	0	0
U.S. treasury securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Short-term investments	0	0
Long-term Investments	0	0
Agency bonds | Fair Value, Measurements, Recurring
Assets
Short-term investments	23,003	11,906
Long-term Investments	0	0
Agency bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Short-term investments	23,003	11,906
Agency bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Short-term investments	0	0
Agency bonds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Short-term investments	0	0
Forward sales commitments | Fair Value, Measurements, Recurring
Assets
Other current assets	13,153	138
Liabilities
Accrued and other liabilities	263	93
Forward sales commitments | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Other current assets	0	0
Liabilities
Accrued and other liabilities	0	0
Forward sales commitments | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Other current assets	13,153	138
Liabilities
Accrued and other liabilities	263	93
Forward sales commitments | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Other current assets	0	0
Liabilities
Accrued and other liabilities	0	0
IRLCs | Fair Value, Measurements, Recurring
Assets
Other current assets	5,764	1,191
Liabilities
Accrued and other liabilities	4,716	60
IRLCs | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Other current assets	0	0
Liabilities
Accrued and other liabilities	0	0
IRLCs | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Other current assets	0	0
Liabilities
Accrued and other liabilities	0	0
IRLCs | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Other current assets	5,764	1,191
Liabilities
Accrued and other liabilities	$ 4,716	60
Equity securities
Assets
Short-term investments		5,113
Equity securities | Fair Value, Measurements, Recurring
Assets
Short-term investments		5,113
Long-term Investments		0
Equity securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Short-term investments		5,113
Equity securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Short-term investments		0
Equity securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Short-term investments		$ 0