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Fair Value Measurements
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements We determine the fair values of our financial instruments based on the 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. 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 at the measurement date. The fair value assumes that the transaction to sell the asset or transfer the liability occurs in the principal or most advantageous market for the asset or liability and establishes that the fair value of an asset or liability shall be determined based on the assumptions that market participants would use in pricing the asset or liability. The classification of a financial asset or liability within the hierarchy is based upon the lowest level input that is significant to the fair value measurement. The fair value hierarchy prioritizes the inputs into three levels that may be used to measure fair value:
Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2 - Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.
Level 3 - Inputs are unobservable inputs based on our assumptions.
Financial Assets
Cash equivalents primarily consist of AAA-rated money market funds with overnight liquidity and no stated maturities. We classified cash equivalents as Level 1 due to the short-term nature of these instruments and measured the fair value based on quoted prices in active markets for identical assets.
When available, our marketable securities are valued using quoted prices for identical instruments in active markets. If we are unable to value our marketable securities using quoted prices for identical instruments in active markets, we value our investments using broker reports that utilize quoted market prices for comparable instruments. As of December 31, 2021 and 2020, all of our marketable securities were valued using quoted prices for comparable instruments in active markets and are classified as Level 2.
Based on our valuation of our money market funds and marketable securities, we concluded that they are classified in either Level 1 or Level 2. The following table presents information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
Fair Value Measurements as of December 31, 2021Fair Value Measurements as of December 31, 2020
DescriptionTotalLevel 1Level 2TotalLevel 1Level 2
Money market funds$259,754 $259,754 $— $265,578 $265,578 $— 
Commercial paper10,479 — 10,479 21,489 — 21,489 
U.S. treasury debt securities54,605 — 54,605 51,809 — 51,809 
Corporate debt securities161,461 — 161,461 147,882 — 147,882 
Foreign government debt securities5,015 — 5,015 1,027 — 1,027 
$491,314 $259,754 $231,560 $487,785 $265,578 $222,207 
Included in cash and cash equivalents$261,254 $280,578 
Included in marketable securities$230,060 $207,207 
We completed acquisitions during the year ended December 31, 2021. The values of the net assets acquired and any resulting goodwill were recorded at fair value using Level 3 inputs. The majority of the related current assets acquired and liabilities assumed were recorded at their carrying values as of the date of acquisition, as their carrying values approximated their fair values due to their short-term nature. The fair values of goodwill and definite-lived intangible assets acquired in the acquisition was externally estimated primarily based on the income approach. The income approach estimates fair value
based on the present value of the cash flows that the assets are expected to generate in the future. We developed internal estimates for the expected cash flows and discount rates used in the present value calculations.
Convertible Senior Notes
As of December 31, 2021, the fair value of our convertible senior notes was $614.7 million. The fair value was determined based on the quoted price of the convertible senior notes in an over-the-counter market on the last trading day of the reporting period and has been classified as Level 2 in the fair value hierarchy. See Note 8 to the consolidated financial statements for more information.