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Fair Value Measurements (Tables)
6 Months Ended
Jun. 28, 2019
Fair Value Disclosures [Abstract]  
Classification of Financial Assets Measured and Recorded at Fair Value on a Recurring Basis
The classifications within the fair value hierarchy of our financial assets that were measured and recorded at fair value on a recurring basis were as follows (in thousands):
 
June 30, 2019
 
Level 1
 
Level 2
 
Total
Money market funds
$
54,457

 
$

 
$
54,457

Commercial paper

 
406,238

 
406,238

Corporate bonds

 
562,750

 
562,750

U.S. Treasury and government sponsored enterprises

 
112,254

 
112,254

Total investments available-for-sale
54,457

 
1,081,242

 
1,135,699

Certificates of deposit

 
22,992

 
22,992

Total financial assets carried at fair value
$
54,457

 
$
1,104,234

 
$
1,158,691

 
December 31, 2018
 
Level 1
 
Level 2
 
Total
Money market funds
$
47,744

 
$

 
$
47,744

Commercial paper

 
381,133

 
381,133

Corporate bonds

 
344,064

 
344,064

U.S. Treasury and government sponsored enterprises

 
55,201

 
55,201

Total investments available-for-sale
47,744

 
780,398

 
828,142

Certificates of deposit

 
16,596

 
16,596

Total financial assets carried at fair value
$
47,744

 
$
796,994

 
$
844,738