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Financial Instruments
9 Months Ended
Sep. 30, 2022
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, 2022December 31, 2021
Forward sales commitments$476,903 $70,550 
IRLCs390,091 67,485 
The locations and amounts of gains (losses) recognized in income related to our derivatives are as follows:

Three Months Ended September 30,Nine Months Ended September 30,
InstrumentClassification2022202120222021
Forward sales commitmentsService revenue$11,602 $859 $1,757 $938 
IRLCsService revenue(8,462)(888)(4,433)(687)

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, 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$294,396 $294,396 $— $— 
Total cash equivalents294,396 294,396 — — 
Short-term investments
U.S. treasury securities87,313 87,313 — — 
Agency bonds23,003 23,003 — — 
Total short-term investments110,316 110,316 — — 
Loans held for sale256,339 — 256,339 — 
Other current assets
Forward sales commitments13,153 — 13,153 — 
IRLCs5,764 — — 5,764 
Total other current assets18,917 — 13,153 5,764 
Mortgage servicing rights, at fair value36,914 — — 36,914 
Long-term investments
U.S. treasury securities41,677 41,677 — — 
Total assets$758,559 $446,389 $269,492 $42,678 
Liabilities
Accrued and other liabilities
Forward sales commitments$263 $— $263 $— 
IRLCs4,716 — — 4,716 
Total liabilities$4,979 $— $263 $4,716 
Balance at December 31, 2021Quoted 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$509,971 $509,971 $— $— 
Total cash equivalents509,971 509,971 — — 
Short-term investments
   U.S. treasury securities16,718 16,718 — — 
Agency bonds11,906 11,906 — — 
Equity securities5,113 5,113 — — 
Loans held for sale35,759 — 35,759 — 
Other current assets
Forward sales commitments138 — 138 — 
IRLCs1,191 — — 1,191 
Total other current assets1,329 — 138 1,191 
Long-term investments
U.S. treasury securities54,828 54,828 — — 
Total assets$635,624 $598,536 $35,897 $1,191 
Liabilities
Accrued liabilities
Forward sales commitments$93 $— $93 $— 
IRLCs60 — — 60 
Total liabilities$153 $— $93 $60 

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

The significant unobservable inputs used to determine the fair value of IRLCs and MSRs that could result in a significant change in fair value measurement were as follows:

September 30, 2022December 31, 2021
Key InputsValuation TechniqueRangeWeighted-AverageRangeWeighted-Average
IRLCs
Pull-through rate
Market pricing
58.0% - 100.0%
91.7%71.1%71.1%
MSRs
Prepayment speedDiscounted cash flow
6.0% - 14.2%
6.5%N/AN/A
Default ratesDiscounted cash flow
0.0% - 0.5%
0.1%N/AN/A
Discount rateDiscounted cash flow
9.5% - 12.4%
9.6%N/AN/A

The following is a summary of changes in the fair value of IRLCs for the three and nine months ended September 30, 2022 and 2021:

Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Balance, net—beginning of period$9,510 $1,972 $1,155 $1,771 
IRLCs acquired in business combination— — 4,326 — 
Issuances of IRLCs20,440 3,849 40,740 14,523 
Settlements of IRLCs(23,494)(4,248)(40,762)(14,956)
Fair value changes recognized in earnings(5,408)(489)(4,411)(254)
Balance, net—end of period$1,048 $1,084 $1,048 $1,084 
The following is a summary of changes in the fair value of MSRs for the three and nine months ended September 30, 2022 and 2021:

Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Balance—beginning of period$35,050 $— $— $— 
MSRs acquired in business combination— — 33,982 — 
MSRs originated1,811 — 2,774 — 
MSRs sales(541)— (1,314)— 
Fair value changes recognized in earnings594 — 1,472 — 
Balance, net—end of period$36,914 $— $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, 2022December 31, 2021
IssuanceNet Carrying AmountEstimated Fair ValueNet Carrying AmountEstimated Fair Value
2023 notes$23,393 $21,634 $23,280 $34,487 
2025 notes652,854 385,985 650,783 593,366 
2027 notes564,914 285,511 563,234 467,814 

The difference between the principal amounts of our 2023 notes, our 2025 notes, and our 2027 notes, which were $23,512, $661,250, 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 $5.84 on September 30, 2022, the if-converted values of all three convertible notes were less than the principal amounts, respectively. See Note 15 for additional details on our convertible senior notes.

See Note 11 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, available-for-sale investments, and equity securities were as follows:

September 30, 2022
Cost or Amortized CostUnrealized GainsUnrealized LossesEstimated Fair ValueCash, Cash Equivalents, and Restricted CashShort-term InvestmentsLong-term Investments
Cash$65,328 $— $— $65,328 $65,328 $— $— 
Money markets funds294,396 — — 294,396 294,396 — — 
Restricted cash43,992 — — 43,992 43,992 — — 
U.S. treasury securities130,002 26 (1,038)128,990 — 87,313 41,677 
Agency bonds23,000 — 23,003 — 23,003 — 
Total$556,718 $29 $(1,038)$555,709 $403,716 $110,316 $41,677 
December 31, 2021
Cost or Amortized CostUnrealized GainsUnrealized LossesEstimated Fair ValueCash, Cash Equivalents, and Restricted CashShort-term InvestmentsLong-term Investments
Cash$81,032 $— $— $81,032 $81,032 $— $— 
Money markets funds509,971 — — 509,971 509,971 — — 
Restricted cash127,278 — — 127,278 127,278 — — 
U.S. treasury securities71,749 (204)71,546 — 16,718 54,828 
Agency bonds11,900 — 11,906 — 11,906 — 
Equity securities500 4,613 — 5,113 — 5,113 — 
Total$802,430 $4,620 $(204)$806,846 $718,281 $33,737 $54,828 

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, 2022 and December 31, 2021, we had accrued interest of $363 and $86, 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.