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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Assets Measured On Recurring Basis
The following table presents information about the Company’s financial instruments that are measured at fair value on a recurring basis using the input categories discussed in Note 1: 
 
As of December 31, 2018
 
Level 1
 
Level 2
 
Level 3
 
Total
 
 
 
 
 
 
 
 
Cash equivalents
 
 
 
 
 
 
 
Money market funds
$
355.5

 
$

 
$

 
$
355.5

U.S Treasury securities

 
33.4

 

 
33.4

Commercial paper

 
27.4

 

 
27.4

Total cash equivalents
$
355.5

 
$
60.8

 
$

 
$
416.3

Short-term investments
 
 
 
 
 
 
 
Corporate notes and obligations

 
269.2

 

 
269.2

U.S. Treasury securities

 
175.9

 

 
175.9

Certificates of deposit

 
70.6

 

 
70.6

U.S. agency obligations

 
37.1

 

 
37.1

Commercial paper

 
17.2

 

 
17.2

Total short-term investments

 
570.0

 

 
570.0

Total cash equivalents and short-term investments
$
355.5

 
$
630.8

 
$

 
$
986.3