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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2019
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 March 31, 2019, and December 30, 2018:
 
 
March 31, 2019
(In thousands)
 
Amortized Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair Value
Short-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
141,399

 
$
25

 
$
(279
)
 
$
141,145

U.S. Treasury securities
 
121,241

 
9

 
(183
)
 
121,067

U.S. governmental agency securities
 
88,157

 
8

 
(346
)
 
87,819

Certificates of deposit
 
21,688

 
—

 
—

 
21,688

Commercial paper
 
16,358

 
—

 
—

 
16,358

Total short-term AFS securities
 
$
388,843

 
$
42

 
$
(808
)
 
$
388,077

Long-term AFS securities
 
 
 
 
 
 
 

Corporate debt securities
 
$
107,085

 
$
372

 
$
(165
)
 
$
107,292

U.S. governmental agency securities
 
39,315

 
7

 
(92
)
 
39,230

U.S. Treasury securities
 
38,688

 
28

 
(155
)
 
38,561

Total long-term AFS securities
 
$
185,088

 
$
407

 
$
(412
)
 
$
185,083


 
 
December 30, 2018
(In thousands)
 
Amortized Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair Value
Short-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
140,631

 
$
1

 
$
(464
)
 
$
140,168

U.S. Treasury securities
 
107,717

 
—

 
(232
)
 
107,485

U.S. governmental agency securities
 
92,628

 
—

 
(654
)
 
91,974

Certificates of deposit
 
23,497

 
—

 
—

 
23,497

Commercial paper
 
8,177

 
—

 
—

 
8,177

Total short-term AFS securities
 
$
372,650

 
$
1

 
$
(1,350
)
 
$
371,301

Long-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
130,612

 
$
44

 
$
(1,032
)
 
$
129,624

U.S. governmental agency securities
 
37,362

 
3

 
(168
)
 
37,197

U.S. Treasury securities
 
47,079

 
5

 
(347
)
 
46,737

Total long-term AFS securities
 
$
215,053

 
$
52

 
$
(1,547
)
 
$
213,558
Schedule of AFS Securities in Unrealized Loss Position
The following tables represent the AFS securities as of March 31, 2019, and December 30, 2018, that were in an unrealized loss position, aggregated by investment category and the length of time that individual securities have been in a continuous loss position:
 
 
March 31, 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
 
$
41,565

 
$
(8
)
 
$
65,613

 
$
(271
)
 
$
107,178

 
$
(279
)
U.S. Treasury securities
 
40,594

 
(7
)
 
36,612

 
(176
)
 
77,206

 
(183
)
U.S. governmental agency securities
 
8,347

 
(6
)
 
71,267

 
(340
)
 
79,614

 
(346
)
Total short-term AFS securities
 
$
90,506

 
$
(21
)
 
$
173,492

 
$
(787
)
 
$
263,998

 
$
(808
)
Long-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
28,658

 
$
(57
)
 
$
15,799

 
$
(108
)
 
$
44,457

 
$
(165
)
U.S. governmental agency securities
 
13,289

 
(22
)
 
11,929

 
(70
)
 
25,218

 
(92
)
U.S. Treasury securities
 
9,491

 
(20
)
 
15,553

 
(135
)
 
25,044

 
(155
)
Total long-term AFS securities
 
$
51,438

 
$
(99
)
 
$
43,281

 
$
(313
)
 
$
94,719

 
$
(412
)
 
 
December 30, 2018
 
 
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
 
$
76,886

 
$
(115
)
 
$
61,459

 
$
(349
)
 
$
138,345

 
$
(464
)
U.S. Treasury securities
 
70,830

 
(31
)
 
28,207

 
(201
)
 
99,037

 
(232
)
U.S. governmental agency securities
 
11,664

 
(4
)
 
80,311

 
(650
)
 
91,975

 
(654
)
Certificates of deposit
 
$
1,599

 
$
—

 
$
—

 
$
—

 
$
1,599

 
$
—

Total short-term AFS securities
 
$
160,979

 
$
(150
)
 
$
169,977

 
$
(1,200
)
 
$
330,956

 
$
(1,350
)
Long-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
81,655

 
$
(570
)
 
$
27,265

 
$
(462
)
 
$
108,920

 
$
(1,032
)
U.S. governmental agency securities
 
21,579

 
(36
)
 
11,868

 
(132
)
 
33,447

 
(168
)
U.S. Treasury securities
 
20,479

 
(29
)
 
23,762

 
(318
)
 
44,241

 
(347
)
Total long-term AFS securities
 
$
123,713

 
$
(635
)
 
$
62,895

 
$
(912
)
 
$
186,608

 
$
(1,547
)