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v3.19.3

Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Sep. 27, 2019 | Dec. 28, 2018
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 209,610 | $ 208,693
Gross Unrealized Gains | 361 | 91
Gross Unrealized Losses | (3) | (230)
Estimated Fair Value | 209,968 | 208,554
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 110,052 | 120,846
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 110,052 | 120,846
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 22,791 | 6,213
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 22,791 | 6,213
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 22,791 | 6,213
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 22,791 | 6,213
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 132,843 | 127,059
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 132,843 | 127,059
U.S. Treasury and agency securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 76,767 | 81,634
Gross Unrealized Gains | 361 | 91
Gross Unrealized Losses | (3) | (230)
Estimated Fair Value | 77,125 | 81,495
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 76,767 | 81,634
Gross Unrealized Gains | 361 | 91
Gross Unrealized Losses | (3) | (230)
Estimated Fair Value | $ 77,125 | $ 81,495

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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