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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Jun. 28, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 305,170 | $ 211,596
Available-for-sale marketable securities, Unrealized Gain | 8,756 | 4,687
Available-for-sale marketable securities, Unrealized (Loss) | (151) | (262)
Available-for-sale marketable securities, Fair Market Value | 313,775 | 216,021
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 20,156 | 23,999
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 163,586 | 42,167
Available-for-sale marketable securities, Unrealized Gain | 1,734 | 431
Available-for-sale marketable securities, Unrealized (Loss) | (15) | (216)
Available-for-sale marketable securities, Fair Market Value | 165,305 | 42,382
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 18,709 | 17,556
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 63,774 | 54,124
Available-for-sale marketable securities, Unrealized Gain | 70 | 26
Available-for-sale marketable securities, Unrealized (Loss) | 0 | (1)
Available-for-sale marketable securities, Fair Market Value | 63,844 | 54,149
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 0 | 1,391
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 56,672 | 93,267
Available-for-sale marketable securities, Unrealized Gain | 6,682 | 4,081
Available-for-sale marketable securities, Unrealized (Loss) | (136) | (41)
Available-for-sale marketable securities, Fair Market Value | 63,218 | 97,307
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,447 | 2,009
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 9,498 | 4,751
Available-for-sale marketable securities, Unrealized Gain | 8 |
Available-for-sale marketable securities, Fair Market Value | 9,506 | 4,751
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 4,353 | 9,942
Available-for-sale marketable securities, Unrealized Gain | 72 | 14
Available-for-sale marketable securities, Unrealized (Loss) | 0 | (4)
Available-for-sale marketable securities, Fair Market Value | 4,425 | 9,952
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 0 | 3,043
Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 6,686 | 6,753
Available-for-sale marketable securities, Unrealized Gain | 190 | 135
Available-for-sale marketable securities, Fair Market Value | 6,876 | 6,888
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 601 | 592
Available-for-sale marketable securities, Fair Market Value | $ 601 | $ 592

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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