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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2020
Fair Value of Financial Instruments  
Fair Value of Financial Instruments

9. Fair Value of Financial Instruments

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. Accounting guidance also establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:

Level 1—Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2—Includes other inputs that are directly or indirectly observable in the marketplace.

Level 3—Unobservable inputs that are supported by little or no market activities, therefore requiring an entity to develop its own assumptions.

The following table presents the carrying value in the condensed consolidated financial statements and approximate fair value of financial instruments at September 30, 2020 and December 31, 2019:

September 30, 2020

December 31, 2019

    

Carrying Value

    

Fair Value

    

Carrying Value

    

Fair Value

Short-term investments(1)

$

451,178

$

451,369

$

119,595

$

119,673

Exchangeable Senior Notes (2)

$

136,174

$

277,891

$

134,654

$

185,558

(1)Short-term investments consisting of obligations of the U.S. government with an original maturity at the time of purchase of greater than three months are classified as held-to-maturity and valued using Level 1 inputs.
(2)The fair value is determined based upon Level 2 inputs as the Exchangeable Senior Notes were trading in the private market.

At September 30, 2020, cash equivalent instruments consisted of $93.5 million in short-term money market funds that were measured using the net asset value per share that have not been classified using the fair value hierarchy. The fund invests primarily in short-term U.S. Treasury and government securities. Short-term investments consisting of certificate of deposits and obligations of the U.S. government are stated at amortized cost, which approximates their relative fair values due to the short-term maturities and market rates of interest of these instruments.

The carrying amounts of financial instruments such as cash equivalents invested in certificates of deposit, obligations of the U.S. government with an original maturity at the time of purchase of less than or equal to three months, accounts payable, accrued expenses and other liabilities approximate their fair values due to the short-term maturities and market rates of interest of these instruments.