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v3.19.2

Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Jun. 28, 2019 | Dec. 28, 2018
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 194,075 | $ 208,693
Gross Unrealized Gains | 423 | 91
Gross Unrealized Losses | (24) | (230)
Estimated Fair Value | 194,474 | 208,554
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 95,230 | 120,846
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 95,230 | 120,846
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 4,222 | 6,213
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4,222 | 6,213
U.S. Treasury securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 5,000 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 5,000 |
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 9,222 | 6,213
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 9,222 | 6,213
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 104,452 | 127,059
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 104,452 | 127,059
U.S. Treasury and agency securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 89,623 | 81,634
Gross Unrealized Gains | 423 | 91
Gross Unrealized Losses | (24) | (230)
Estimated Fair Value | 90,022 | 81,495
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 89,623 | 81,634
Gross Unrealized Gains | 423 | 91
Gross Unrealized Losses | (24) | (230)
Estimated Fair Value | $ 90,022 | $ 81,495

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