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Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Jul. 02, 2021 | Jan. 01, 2021
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost |  | $ 242,518
Gross Unrealized Gains |  | 8
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 242,526
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 138,381 | 146,083
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 138,381 | 146,083
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 101,572 | 51,442
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 101,572 | 51,442
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 101,572 | 51,442
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 101,572 | 51,442
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 239,953 | 197,525
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 239,953 | 197,525
U.S. Treasury and agency securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost |  | 44,993
Gross Unrealized Gains |  | 8
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 45,001
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost |  | 44,993
Gross Unrealized Gains |  | 8
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | $ 45,001

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