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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Measurements  
Schedule of assets measured at fair value on a recurring basis

Fair Value Measurements as of September 30, 2020

    

Total

    

Level 1

    

Level 2

    

Level 3

Cash and cash equivalents

$

418,228

$

418,228

$

$

Marketable securities

Bonds and bond funds

$

95,183

$

$

95,183

$

Commercial paper

 

308,610

 

 

308,610

 

403,793

 

 

403,793

 

Total assets measured at fair value

$

822,021

$

418,228

$

403,793

$

Fair Value Measurements as of December 31, 2019

    

Total

    

Level 1

    

Level 2

    

Level 3

Cash and cash equivalents

$

87,206

$

87,206

$

$

Marketable securities

Bonds and bond funds

$

267,243

$

$

267,243

$

Commercial paper

 

165,723

 

 

165,723

 

432,966

 

 

432,966

 

Total assets measured at fair value

$

520,172

$

87,206

$

432,966

$