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Marketable Securities - (Tables)
 6 Months Ended
Jun. 28, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Market Value of AFS Securities
The following tables present the amortized cost, gross unrealized gains and losses, and fair market value of our AFS debt securities as of June 28, 2020, and December 29, 2019:
 
 
June 28, 2020
(In thousands)
 
Amortized Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair Value
Short-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
105,615

 
$
669

 
$
(13
)
 
$
106,271

U.S. Treasury securities
 
78,826

 
179

 
(1
)
 
79,004

U.S. governmental agency securities
 
35,965

 
180

 
(1
)
 
36,144

Commercial paper
 
15,981

 
—

 
—

 
15,981

Certificates of deposit
 
3,000

 
—

 
—

 
3,000

Total short-term AFS securities
 
$
239,387

 
$
1,028

 
$
(15
)
 
$
240,400

Long-term AFS securities
 
 
 
 
 
 
 

Corporate debt securities
 
$
114,618

 
$
1,751

 
$
(28
)
 
$
116,341

U.S. Treasury securities
 
92,680

 
2,714

 
—

 
95,394

U.S. governmental agency securities
 
55,089

 
125

 
(3
)
 
55,211

Total long-term AFS securities
 
$
262,387

 
$
4,590

 
$
(31
)
 
$
266,946


 
 
December 29, 2019
(In thousands)
 
Amortized Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair Value
Short-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
98,864

 
$
271

 
$
(9
)
 
$
99,126

U.S. Treasury securities
 
43,098

 
8

 
(11
)
 
43,095

U.S. governmental agency securities
 
37,471

 
35

 
(4
)
 
37,502

Commercial paper
 
12,561

 
—

 
—

 
12,561

Certificates of deposit
 
9,501

 
—

 
—

 
9,501

Total short-term AFS securities
 
$
201,495

 
$
314

 
$
(24
)
 
$
201,785

Long-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
103,149

 
$
617

 
$
(29
)
 
$
103,737

U.S. Treasury securities
 
101,457

 
84

 
(103
)
 
101,438

U.S. governmental agency securities
 
46,600

 
5

 
(84
)
 
46,521

Total long-term AFS securities
 
$
251,206

 
$
706

 
$
(216
)
 
$
251,696
Schedule of AFS Securities in Unrealized Loss Position
The following tables represent the AFS securities as of June 28, 2020, and December 29, 2019, that were in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:
 
 
June 28, 2020
 
 
Less than 12 Months
 
12 Months or Greater
 
Total
(In thousands)
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
Short-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
22,721

 
$
(13
)
 
$
—

 
$
—

 
$
22,721

 
$
(13
)
U.S. Treasury securities
 
14,496

 
(1
)
 
—

 
—

 
14,496

 
(1
)
U.S. governmental agency securities
 
9,999

 
(1
)
 
—

 
—

 
9,999

 
(1
)
Total short-term AFS securities
 
$
47,216

 
$
(15
)
 
$
—

 
$
—

 
$
47,216

 
$
(15
)
Long-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
17,542

 
$
(28
)
 
$
—

 
$
—

 
$
17,542

 
$
(28
)
U.S. governmental agency securities
 
8,747

 
(3
)
 
—

 
—

 
8,747

 
(3
)
Total long-term AFS securities
 
$
26,289

 
$
(31
)
 
$
—

 
$
—

 
$
26,289

 
$
(31
)
    
 
 
December 29, 2019
 
 
Less than 12 Months
 
12 Months or Greater
 
Total
(In thousands)
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
Short-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
20,975

 
$
(6
)
 
$
8,251

 
$
(3
)
 
$
29,226

 
$
(9
)
U.S. Treasury securities
 
13,296

 
(3
)
 
11,147

 
(8
)
 
24,443

 
(11
)
U.S. governmental agency securities
 
—

 
—

 
15,000

 
(4
)
 
15,000

 
(4
)
Total short-term AFS securities
 
$
34,271

 
$
(9
)
 
$
34,398

 
$
(15
)
 
$
68,669

 
$
(24
)
Long-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
35,891

 
$
(25
)
 
$
4,502

 
$
(4
)
 
$
40,393

 
$
(29
)
U.S. Treasury securities
 
60,935

 
(103
)
 
—

 
—

 
60,935

 
(103
)
U.S. governmental agency securities
 
34,167

 
(84
)
 
—

 
—

 
34,167

 
(84
)
Total long-term AFS securities
 
$
130,993

 
$
(212
)
 
$
4,502

 
$
(4
)
 
$
135,495

 
$
(216
)