Financial Instruments - Schedule of Assets, Liabilities, and Equity Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Liabilities
Mortgage servicing rights, at fair value	$ 34,773	$ 36,261
Fair Value, Measurements, Recurring
Assets
Cash equivalents	91,399	186,410
Loans held for sale	137,680	199,604
Other current assets	5,257	4,007
Total assets	316,335	578,021
Liabilities
Total liabilities	792	2,914
Mortgage servicing rights, at fair value	34,773	36,261
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	41,752	122,259
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent	5,474	29,480
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash equivalents	91,399	186,410
Loans held for sale	0	0
Other current assets	0	0
Total assets	138,625	338,149
Liabilities
Total liabilities	0	0
Mortgage servicing rights, at fair value	0	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	41,752	122,259
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent	5,474
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Cash equivalents	0	0
Loans held for sale	137,680	199,604
Other current assets	2,190	1,669
Total assets	139,870	201,273
Liabilities
Total liabilities	27	1,873
Mortgage servicing rights, at fair value	0	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	0	0
Loans held for sale	0	0
Other current assets	3,067	2,338
Total assets	37,840	38,599
Liabilities
Total liabilities	765	1,041
Mortgage servicing rights, at fair value	34,773	36,261
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current		0
Fair Value, Measurements, Recurring | Money market funds
Assets
Cash equivalents	91,399	186,410
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash equivalents	91,399	186,410
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
Liabilities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	8,349	96,925
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent	5,474	29,480
U.S. treasury securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	8,349	96,925
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent	5,474
U.S. treasury securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Short-term investments		0
Liabilities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent	0
U.S. treasury securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Short-term investments		0
Liabilities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent	0
Agency bonds | Fair Value, Measurements, Recurring
Liabilities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	33,403	25,334
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent	0	0
Agency bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current	33,403	25,334
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent		29,480
Agency bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Short-term investments	0	0
Long-term investments		0
Agency bonds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Short-term investments	0	0
Long-term investments		0
Forward sales commitments | Fair Value, Measurements, Recurring
Assets
Other current assets	2,190	1,669
Liabilities
Accrued liabilities	27	1,873
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 liabilities	0	0
Forward sales commitments | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Other current assets	2,190	1,669
Liabilities
Accrued liabilities	27	1,873
Forward sales commitments | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Other current assets	0	0
Liabilities
Accrued liabilities	0	0
IRLCs | Fair Value, Measurements, Recurring
Assets
Other current assets	3,067	2,338
Liabilities
Accrued liabilities	765	1,041
IRLCs | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Other current assets	0	0
Liabilities
Accrued liabilities	0	0
IRLCs | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Other current assets	0	0
Liabilities
Accrued liabilities	0	0
IRLCs | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Other current assets	3,067	2,338
Liabilities
Accrued liabilities	$ 765	$ 1,041