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Financial Instruments
9 Months Ended
Sep. 30, 2020
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.

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.

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.
Notional AmountsSeptember 30, 2020December 31, 2019
Interest rate lock commitments$74,681 $37,453 
Forward sales commitments116,091 39,447 

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,
InstrumentClassification2020201920202019
Interest rate lock commitmentsService revenue$(233)$(209)$1,131 $225 
Forward sales commitmentsService revenue553 554 442 312 

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, 2020Quoted 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$336,821 $336,821 $— $— 
U.S. treasury securities5,351 5,351 — — 
Total cash equivalents342,172 342,172 — — 
Short-term investments
U.S. treasury securities129,809 129,809 — — 
Loans held for sale41,921 — 41,921 — 
Prepaid expenses and other current assets
Interest rate lock commitments1,965 — — 1,965 
Forward sales commitments763 — 763 — 
Total prepaid expenses and other current assets2,728 — 763 1,965 
Long-term investments
U.S. treasury securities5,150 5,150 — — 
Agency bonds11,922 11,922 — — 
Total long-term investments17,072 17,072 — — 
Total assets$533,702 $489,053 $42,684 $1,965 
Liabilities
Accrued liabilities
Interest rate lock commitments$404 $— $— $404 
Forward sales commitments23 — 23 — 
Total liabilities$427 $— $23 $404 
Balance at December 31, 2019Quoted 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$221,442 $221,442 $— $— 
Short-term investments
U.S. treasury securities70,029 70,029 — — 
Loans held for sale21,985 — 21,985 — 
Prepaid expenses and other current assets
Interest rate lock commitments496 — — 496 
Forward sales commitments— — 
Total prepaid expenses and other current assets500 — 496 
Long-term investments
U.S. treasury securities30,978 30,978 — — 
Total assets$344,934 $322,449 $21,989 $496 
Liabilities
Accrued liabilities
Interest rate lock commitments$58 $— $— $58 
Forward sales commitments57 — 57 — 
Total liabilities$115 $— $57 $58 

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:
Key InputsValuation TechniqueSeptember 30, 2020December 31, 2019
Weighted-average pull-through rate
Market pricing
72.0%78.2%

The following is a summary of changes in the fair value of IRLCs for the period ended September 30, 2020:
Balance, net—January 1, 2020$430 
Issuances of interest rate lock commitments 12,827 
Settlements of interest rate lock commitments(11,299)
Net loss recognized in earnings(397)
Balance, net—September 30, 2020$1,561 
Changes in fair value recognized during the period relating to assets still held at September 30, 2020$1,131 

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

See Note 15 for the carrying amount and estimated fair value of our 2023 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, cost method investments, and other assets. These assets are measured at fair value if determined to be impaired. During the nine months ended September 30, 2020 we determined that the fair value of one of our cost method investment in a privately-held company was less than the carrying value of $2,000 based on a variety of impairment indicators, including the historical performance and future prospects of the company; therefore, we recognized a non-cash impairment charge of $499 and $1,919 related to this investment during the three and nine months ended September, 30, 2020, respectively. The impairment charges are included in Impairment costs within our consolidated statement of cash flows and is included in Other income (expense), net within our consolidated statements of
comprehensive income (loss). We did not record any other significant nonrecurring fair value measurements after initial recognition for the three and nine months ended September 30, 2020.

The following table summarizes 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.
September 30, 2020
Cost or Amortized CostUnrealized GainsUnrealized LossesEstimated Fair ValueCash, Cash Equivalents, Restricted CashShort-term InvestmentsLong-term Investments
Cash$29,401 $— $— $29,401 $29,401 $— $— 
Money markets funds336,821 — — 336,821 336,821 — — 
Restricted cash16,393 — — 16,393 16,393 — — 
U.S. treasury securities140,040 270 — 140,310 5,351 129,809 5,150 
Agency bonds11,900 22 — 11,922 — — 11,922 
Total$534,555 $292 $— $534,847 $387,966 $129,809 $17,072 

December 31, 2019
Cost or Amortized CostUnrealized GainsUnrealized LossesEstimated Fair ValueCash, Cash Equivalents, Restricted CashShort-term InvestmentsLong-term Investments
Cash$13,237 $— $— $13,237 $13,237 $— $— 
Money markets funds221,442 — — 221,442 221,442 — — 
Restricted cash12,769 — — 12,769 12,769 — — 
U.S. treasury securities100,998 31 (22)101,007 — 70,029 30,978 
Total$348,446 $31 $(22)$348,455 $247,448 $70,029 $30,978 

As of September 30, 2020 and December 31, 2019, the aggregate fair value of available-for-sale debt securities in an unrealized loss position totaled $0 and $46,550, with aggregate unrealized losses of $0 and $22, respectively. 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, 2020 and December 31, 2019, we had accrued interest of $103 and $183, respectively, on our available-for-sale investments, of which we have recorded no expected credit losses. Accrued interest receivable is presented within other current assets in our consolidated balance sheets.