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v3.20.2

Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Jul. 03, 2020 | Jan. 03, 2020
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 189,886 | $ 231,277
Gross Unrealized Gains | 266 | 324
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 190,152 | 231,601
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 92,908 | 135,225
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 92,908 | 135,225
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 63,024 | 41,211
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 63,024 | 41,211
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 63,024 | 41,211
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 63,024 | 41,211
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 155,932 | 176,436
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 155,932 | 176,436
US Treasury and Government Short-term Debt Securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 33,954 | 54,841
Gross Unrealized Gains | 266 | 324
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 34,220 | 55,165
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 33,954 | 54,841
Gross Unrealized Gains | 266 | 324
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 34,220 | $ 55,165

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