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Fair Value Measurements
9 Months Ended
Sep. 27, 2019
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
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):
 
September 30, 2019
 
Level 1
 
Level 2
 
Total
Money market funds
$
26,641

 
$

 
$
26,641

Commercial paper

 
332,239

 
332,239

Corporate bonds

 
706,807

 
706,807

U.S. Treasury and government sponsored enterprises

 
152,650

 
152,650

Total investments available-for-sale
26,641

 
1,191,696

 
1,218,337

Certificates of deposit

 
29,192

 
29,192

Total financial assets carried at fair value
$
26,641

 
$
1,220,888

 
$
1,247,529

 
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


We did not have any financial liabilities measured and recorded at fair value on a recurring basis as of September 30, 2019 or December 31, 2018. We did not have any financial assets or liabilities classified as Level 3 in the fair value hierarchy as of September 30, 2019 or December 31, 2018. There were no transfers of financial assets or liabilities between Levels 1, 2 and 3 during the three and nine months ended September 30, 2019 or 2018.
When available, we value investments based on quoted prices for those financial instruments, which is a Level 1 input. Our remaining investments are valued using third-party pricing sources, which use observable market prices, interest rates and yield curves observable at commonly quoted intervals for similar assets as observable inputs for pricing, which is a Level 2 input.
See “Note 11. Leases” for a description of the determination of the amount of operating lease liabilities. Our remaining financial assets and liabilities include cash and restricted cash, Trade receivables, net, Other receivables, Accounts payable, Accrued compensation and benefits, Accrued clinical trial liabilities, Accrued collaboration liabilities and Rebates and fees due to customers. Those financial assets and liabilities are carried at cost, which approximates their fair values.