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Financial Instruments
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Financial Instruments Financial Instruments
Derivatives

Our primary market exposure is to interest rate risk, specifically U.S. treasury and mortgage interest rates, due to their impact on mortgage-related assets and commitments. We use forward sales commitments on whole loans and mortgage-backed securities to manage and reduce this risk. We do not have any derivative instruments designated as hedging instruments.

Forward Sales Commitments—We are exposed to interest rate and price risk on loans held for sale from the funding date until the date the loan is sold. Forward sales commitments on whole loans and mortgage-backed securities are used to fix the forward sales price that will be realized at the sale of each loan.
Interest Rate Lock Commitments—Interest rate lock commitments ("IRLCs") represent an agreement to extend credit to a mortgage loan applicant. We commit (subject to loan approval) to fund the loan at the specified rate, regardless of changes in market interest rates between the commitment date and the funding date. Outstanding IRLCs are subject to interest rate risk and related price risk during the period from the date of commitment through the loan funding date or expiration date. Loan commitments generally range between 30 and 90 days and the borrower is not obligated to obtain the loan. Therefore, IRLCs are subject to fallout risk, which occurs when approved borrowers choose not to close on the underlying loans. We review our commitment-to-closing ratio ("pull-through rate") as part of an estimate of the number of mortgage loans that will fund according to the IRLCs.
Notional AmountsSeptember 30, 2023December 31, 2022
Forward sales commitments$322,652 $301,548 
IRLCs249,515 210,787 

The locations and amounts of gains (losses) recognized in income related to our derivatives were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
InstrumentClassification2023202220232022
Forward sales commitmentsRevenue$335 $11,602 $2,367 $1,757 
IRLCsRevenue(1,567)(8,462)1,005 (4,433)

Fair Value of Financial Instruments

A summary of assets and liabilities related to our financial instruments, measured at fair value on a recurring basis and as reflected in our consolidated balance sheets, is set forth below:
Balance at September 30, 2023Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents
Money market funds$91,399 $91,399 $— $— 
Total cash equivalents91,399 91,399 — — 
Short-term investments
U.S. treasury securities8,349 8,349 — — 
Agency bonds33,403 33,403 — — 
Total short-term investments41,752 41,752 — — 
Loans held for sale137,680 — 137,680 — 
Other current assets
Forward sales commitments2,190 — 2,190 — 
IRLCs3,067 — — 3,067 
Total other current assets5,257 — 2,190 3,067 
Mortgage servicing rights, at fair value34,773 — — 34,773 
Long-term investments
U.S. treasury securities5,474 5,474 — — 
Total long-term investments5,474 5,474 — — 
Total assets$316,335 $138,625 $139,870 $37,840 
Liabilities
Accrued liabilities
Forward sales commitments$27 $— $27 $— 
IRLCs765 — — 765 
Total liabilities$792 $— $27 $765 
Balance at December 31, 2022Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents
        Money market funds$186,410 $186,410 $— $— 
Total cash equivalents186,410 186,410 — — 
Short-term investments
   U.S. treasury securities96,925 96,925 — — 
Agency bonds25,334 25,334 — — 
Total short-term investments122,259 122,259 — — 
Loans held for sale199,604 — 199,604 — 
Other current assets
Forward sales commitments1,669 — 1,669 — 
IRLCs2,338 — — 2,338 
Total other current assets4,007 — 1,669 2,338 
Mortgage servicing rights, at fair value36,261 — — 36,261 
Long-term investments
U.S. treasury securities29,480 29,480 — — 
Total assets$578,021 $338,149 $201,273 $38,599 
Liabilities
Accrued liabilities
Forward sales commitments$1,873 $— $1,873 $— 
IRLCs1,041 — — 1,041 
Total liabilities$2,914 $— $1,873 $1,041 

There were no transfers into or out of Level 3 financial instruments during the periods presented.

The significant unobservable input used in the fair value measurement of IRLCs is the pull-through rate. Significant changes in the input could result in a significant change in fair value measurement.

The following is a quantitative summary of key unobservable inputs used in the valuation of IRLCs and Mortgage Servicing Rights (“MSRs”):
September 30, 2023December 31, 2022
Key InputsValuation TechniqueRangeWeighted-AverageRangeWeighted-Average
IRLCs
Pull-through rate
Market pricing
69.7% - 100.0%
93.5%
62.0% - 100.0%
91.0%
MSRs
Prepayment speedDiscounted cash flow
6.0% - 12.0%
6.5%
 6.0% - 14.4%
6.6%
Default ratesDiscounted cash flow
0.1% - 1.0%
0.2%
0.0% - 0.5%
0.1%
Discount rateDiscounted cash flow
10.0% - 12.8%
10.1%
9.5% - 12.4%
9.6%
The following is a summary of changes in the fair value of IRLCs:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Balance, net—beginning of period$3,870 $9,510 $1,297 $1,155 
IRLCs acquired in business combination— — — 4,326 
Issuances of IRLCs10,638 20,440 39,769 40,740 
Settlements of IRLCs(11,650)(23,494)(38,241)(40,762)
Fair value changes recognized in earnings(556)(5,408)(523)(4,411)
Balance, net—end of period$2,302 $1,048 $2,302 $1,048 

The following is a summary of changes in the fair value of MSRs:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Balance—beginning of period$35,503 $35,050 $36,261 $— 
MSRs acquired in business combination— — — 33,982 
MSRs originated120 1,811 699 2,774 
MSRs sales(384)(541)(1,122)(1,314)
Fair value changes recognized in earnings(466)594 (1,065)1,472 
Balance, net—end of period$34,773 $36,914 $34,773 $36,914 

The following table presents the carrying amounts and estimated fair values of our convertible senior notes that are not recorded at fair value on our consolidated balance sheets:
September 30, 2023December 31, 2022
IssuanceNet Carrying AmountEstimated Fair ValueNet Carrying AmountEstimated Fair Value
2023 notes$— $— $23,431 $22,147 
2025 notes232,511 192,411 512,683 309,292 
2027 notes567,154 333,500 565,474 267,398 

The difference between the principal amounts of our 2025 notes and our 2027 notes, which were $234,505 and $575,000, respectively, and the net carrying amounts of the notes represents the unamortized debt issuance costs. The estimated fair value of each tranche of convertible senior notes is based on the closing trading price of the notes on the last day of trading for the period and is classified as Level 2 within the fair value hierarchy due to the limited trading activity of the notes. Based on the closing price of our common stock of $7.04 on September 30, 2023, the if-converted values of both convertible notes were less than the principal amounts, respectively. See Note 14 for additional details on our convertible senior notes.

See Note 10 for the carrying amount of our convertible preferred stock.

Assets and liabilities recognized or disclosed at fair value on a nonrecurring basis include items such as property and equipment, goodwill and other intangible assets, and other assets. These assets are remeasured at fair value if determined to be impaired.
The cost or amortized cost, gross unrealized gains and losses, and estimated fair market value of our cash, money market funds, restricted cash, and available-for-sale investments were as follows:
September 30, 2023
Fair Value HierarchyCost or Amortized CostUnrealized GainsUnrealized LossesEstimated Fair ValueCash, Cash Equivalents, and Restricted CashShort-term InvestmentsLong-term Investments
CashN/A$34,404 $— $— $34,404 $34,404 $— $— 
Money markets fundsLevel 191,399 — — 91,399 91,399 — — 
Restricted cashN/A1,414 — — 1,414 1,414 — — 
U.S. treasury securitiesLevel 113,876 (59)13,823 — 8,349 5,474 
Agency bondsLevel 133,463 — (60)33,403 — 33,403 — 
Total$174,556 $$(119)$174,443 $127,217 $41,752 $5,474 
December 31, 2022
Fair Value HierarchyCost or Amortized CostUnrealized GainsUnrealized LossesEstimated Fair ValueCash, Cash Equivalents, and Restricted CashShort-term InvestmentsLong-term Investments
CashN/A$53,430 $— $— $53,430 $45,790 $— $— 
Money markets fundsLevel 1186,410 — — 186,410 186,410 — — 
Restricted cashN/A2,406 — — 2,406 2,406 — — 
U.S. treasury securitiesLevel 1127,130 28 (753)126,405 — 96,925 29,480 
Agency bondsLevel 125,339 — (5)25,334 — 25,334 — 
Total$394,715 $28 $(758)$393,985 $234,606 $122,259 $29,480 

We have evaluated our portfolio of available-for-sale debt securities based on credit quality indicators for expected credit losses and do not believe there are any expected credit losses. Our portfolio consists of U.S. government securities, all with a high-quality credit rating issued by various credit agencies.

As of September 30, 2023 and December 31, 2022, we had accrued interest of $611 and $576, respectively, on our available-for-sale investments, of which we have recorded no expected credit losses. Accrued interest receivable is recorded in other current assets in our consolidated balance sheets.