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Fair Value Measurements
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
We apply the following methods and assumptions in estimating our fair value measurements:
Cash equivalents — The fair value measurement of money market funds is based on quoted market prices in active markets (Level 1). The fair value measurement of other cash equivalents is based on observable market-based inputs principally derived from or corroborated by observable market data (Level 2).
Short-term investments — The fair value measurement of our short-term investments is based on observable market-based inputs or inputs that are derived principally from or corroborated by observable market data by correlation or other means (Level 2).
Restricted cash — The carrying value of restricted cash approximates fair value due to the short period of time amounts are borrowed on our credit facilities, home sales proceeds are held in restricted accounts for repayment of our credit facilities and amounts are held in escrow (Level 1).
Mortgage loans held for sale — The fair value of mortgage loans held for sale is generally calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics (Level 2).
Interest rate lock commitments — The fair value of interest rate lock commitments (“IRLCs”) is calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics. Expired commitments are excluded from the fair value measurement. Since not all IRLCs will become closed loans, we adjust our fair value measurements for the estimated amount of IRLCs that will not close. This adjustment is effected through the pull-through rate, which represents the probability that an interest rate lock commitment will ultimately result in a closed loan (Level 3).
The following table presents the range and weighted-average pull-through rates used in determining the fair value of IRLCs as of the dates presented:
June 30, 2021December 31, 2020
Range
47% - 100%
47% - 100%
Weighted-average79%75%
Forward contracts — The fair value of mandatory loan sales commitments and derivative instruments such as forward sales of mortgage-backed securities that are utilized as economic hedging instruments is calculated by reference to quoted prices for similar assets (Level 2).
The following tables present the balances of assets and liabilities measured at fair value on a recurring basis, by level within the fair value hierarchy, as of the dates presented (in thousands):
 June 30, 2021
TotalLevel 1Level 2Level 3
Cash equivalents:
Money market funds$3,494,642 $3,494,642 $— $— 
Short-term investments:
U.S. government agency securities829,925 — 829,925 — 
Treasury bills44,988 — 44,988 — 
Municipal securities5,962 — 5,962 — 
Mortgage origination-related:
Mortgage loans held for sale171,450 — 171,450 — 
IRLCs6,413 — — 6,413 
Forward contracts - other current assets69 — 69 — 
Forward contracts - other current liabilities(686)— (686)— 
        Total$4,552,763 $3,494,642 $1,051,708 $6,413 
 December 31, 2020
 TotalLevel 1Level 2Level 3
Cash equivalents:
Money market funds$1,486,384 $1,486,384 $— $— 
Municipal securities3,228 — 3,228 — 
Short-term investments:
Treasury bills1,163,813 — 1,163,813 — 
U.S. government agency securities1,037,577 — 1,037,577 — 
Municipal securities16,220 — 16,220 — 
Certificates of deposit498 — 498 — 
Mortgage origination-related:
Mortgage loans held for sale330,758 — 330,758 — 
IRLCs12,342 — — 12,342 
Forward contracts - other current liabilities(2,608)— (2,608)— 
Total$4,048,212 $1,486,384 $2,549,486 $12,342 
The following table presents the changes in our IRLCs for the periods presented (in thousands):
Three Months Ended
June 30,
Six Months Ended
June 30,
2021202020212020 (1)
Balance, beginning of the period$5,002 $2,225 $12,342 $937 
Issuances16,120 10,142 34,421 15,507 
Transfers(16,041)(8,586)(40,439)(13,142)
Fair value changes recognized in earnings1,332 1,310 89 1,789 
Balance, end of period$6,413 $5,091 $6,413 $5,091 
(1) Beginning balance represents transfers of IRLCs from Level 2 to Level 3 within the fair value hierarchy as of January 1, 2020.
At June 30, 2021, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $355.0 million and $479.3 million for our IRLCs and forward contracts, respectively. At December 31, 2020, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $378.1 million and $652.1 million for our IRLCs and forward contracts, respectively. We do not have the right to offset our derivative positions.
See Note 11 for the carrying amount and estimated fair value of our convertible senior notes.