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Fair Value Measurements
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The standards also establish a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:
Level 1 — Quoted prices in active markets for identical assets or liabilities.
Level 2 — Assets and liabilities valued based on observable market data for similar instruments, such as quoted prices for similar assets or liabilities.
Level 3 — Unobservable inputs that are supported by little or no market activity; instruments valued based on the best available data, some of which is internally developed, and considers risk premiums that a market participant would require.
We applied 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. The fair value measurement of treasury bills are based on observable market-based inputs or inputs that are derived principally from or corroborated by observable market data by correlation or other means.
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.
Restricted cash — Restricted cash consists of cash received from the resale of homes through Zillow Offers which may be used to repay amounts borrowed on our credit facilities (see Note 12) and amounts held in escrow related to funding home purchases in our mortgage origination business. The carrying value of restricted cash approximates fair value due to the short period of time amounts borrowed on the credit facilities are outstanding and amounts are held in escrow.
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.
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. We generally only issue IRLCs for products that meet specific purchaser guidelines. 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.
The pull-through rate is based on estimated changes in market conditions, loan stage and historical borrower behavior. Pull-through rates are directly related to the fair value of IRLCs as an increase in the pull-through rate, in isolation, would result in an increase in the fair value measurement. Conversely, a decrease in the pull-through rate, in isolation, would result in a decrease in the fair value measurement. Changes in the fair value of IRLCs are included within Mortgages revenue in our condensed consolidated statements of operations.
The following table presents the range and weighted average pull-through rates used in determining the fair value of IRLCs as of the periods presented:
June 30, 2020December 31, 2019
Range
40% - 100%
56% - 100%
Weighted average70%78%
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 are calculated by reference to quoted prices for similar assets.
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, 2020
TotalLevel 1Level 2Level 3
Cash equivalents:
Money market funds$1,784,896  $1,784,896  $—  $—  
Treasury bills70,189  —  70,189  —  
Short-term investments:
Treasury bills963,231  —  963,231  —  
U.S. government agency securities465,715  —  465,715  —  
Corporate notes and bonds30,213  —  30,213  —  
Municipal securities16,538  —  16,538  —  
Commercial paper14,972  —  14,972  —  
Certificates of deposit498  —  498  —  
Mortgage origination-related:
Mortgage loans held for sale75,021  —  75,021  —  
IRLCs5,091  —  —  5,091  
Forward contracts - other current liabilities961  —  961  —  
        Total$3,427,325  $1,784,896  $1,637,338  $5,091  
 December 31, 2019
 TotalLevel 1Level 2
Cash equivalents:
Money market funds$872,431  $872,431  $—  
U.S. government agency securities35,009  —  35,009  
Commercial paper31,113  —  31,113  
Treasury bills6,441  —  6,441  
Corporate notes and bonds1,065  —  1,065  
Certificates of deposit249  —  249  
Short-term investments:
U.S. government agency securities862,154  —  862,154  
Corporate notes and bonds159,431  —  159,431  
Commercial paper150,267  —  150,267  
Treasury bills80,003  —  80,003  
Municipal securities27,889  —  27,889  
Certificates of deposit1,245  —  1,245  
Mortgage origination-related:
Mortgage loans held for sale36,507  —  36,507  
IRLCs937  —  937  
Forward contracts - other current assets —   
Forward contracts - other current liabilities(60) —  (60) 
Total$2,264,688  $872,431  $1,392,257  

The following table presents the changes in our IRLCs during the three and six month periods ended June 30, 2020 (in thousands):
Three Months Ended
June 30, 2020
Six Months Ended
June 30, 2020 (1)
Balance, beginning of the period$2,225  $937  
Issuances10,142  15,507  
Transfers(8,586) (13,142) 
Fair value changes recognized in earnings1,310  1,789  
Balance, end of period$5,091  $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, 2020, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $168.9 million and $214.9 million for our IRLCs and forward contracts, respectively. At December 31, 2019, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $34.3 million and $64.7 million for our IRLCs and forward contracts, respectively. We do not have the right to offset our forward contract derivative positions.
See Note 12 for the carrying amount and estimated fair value of our convertible senior notes.