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Fair Value Measurements (Tables)
12 Months Ended
Dec. 29, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Assets Measured on a Recurring Basis
The classification of our financial assets within the fair value hierarchy that were measured and recorded at fair value on a recurring basis were as follows. The amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
 
December 31, 2017
 
Level 1
 
Level 2
 
Total
Money market funds
$
45,478

 
$

 
$
45,478

Commercial paper

 
199,647

 
199,647

Corporate bonds

 
179,022

 
179,022

U.S. Treasury and government sponsored enterprises

 
16,263

 
16,263

Total financial assets
$
45,478

 
$
394,932

 
$
440,410

 
December 31, 2016
 
Level 1
 
Level 2
 
Total
Money market funds
$
71,457

 
$

 
$
71,457

Commercial paper

 
165,375

 
165,375

Corporate bonds

 
152,407

 
152,407

U.S. Treasury and government sponsored enterprises

 
70,727

 
70,727

Total financial assets
$
71,457

 
$
388,509

 
$
459,966

Schedule of Estimated Fair Value of Financial Instruments
The estimated fair value of our financial instruments that are carried at amortized cost was as follows (in thousands):
 
December 31, 2016
 
Carrying
Amount
 
Fair Value
Convertible notes
$
109,122

 
$
121,220

Term loan payable
$
80,000

 
$
79,784