v3.20.2
Fair Value Measurements
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements 
The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of June 30, 2020 (in thousands): 
Level 1Level 2Total
Cash equivalents:
Money market funds$489,607  $—  $489,607  
Commercial paper—  47,691  47,691  
Corporate notes and bonds—  20,944  20,944  
Certificates of deposit—  5,002  5,002  
U.S. government and agency securities—  28,228  28,228  
Marketable securities:
Commercial paper—  415,103  415,103  
Corporate notes and bonds—  1,586,235  1,586,235  
Certificates of deposit—  20,098  20,098  
U.S. government and agency securities—  260,733  260,733  
Total$489,607  $2,384,034  $2,873,641  
 
The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of December 31, 2019 (in thousands): 
Level 1Level 2Total
Cash equivalents:
Money market funds$486,982  $—  $486,982  
Commercial paper—  86,388  86,388  
Marketable securities:
Commercial paper—  101,490  101,490  
Corporate notes and bonds—  1,661,330  1,661,330  
Certificates of deposit—  38,045  38,045  
U.S. government and agency securities—  127,784  127,784  
Total$486,982  $2,015,037  $2,502,019  
 
We determine the fair value of our security holdings based on pricing from our service providers and market prices from industry-standard independent data providers. Such market prices may be quoted prices in active markets for identical assets (Level 1 inputs) or pricing determined using inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs), such as yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for the underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures.

Our equity investments in privately-held companies are not included in the table above and are discussed in Note 3. See Note 8 for the fair value measurement of our derivative contracts and Note 10 for the fair value measurement of our convertible senior notes, which are also not included in the table above.