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Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 297,687 | $ 242,518
Unrealized Gains | 0 | 8
Unrealized Losses | 0 | 0
Estimated Fair Value | 297,687 | 242,526
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 196,106 | 146,083
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 196,106 | 146,083
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 101,581 | 51,442
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 101,581 | 51,442
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 101,581 | 51,442
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 101,581 | 51,442
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 297,687 | 197,525
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 297,687 | 197,525
U.S. Treasury securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 0 | 44,993
Unrealized Gains | 0 | 8
Unrealized Losses | 0 | 0
Estimated Fair Value | 0 | 45,001
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 0 | 44,993
Unrealized Gains | 0 | 8
Unrealized Losses | 0 | 0
Estimated Fair Value | $ 0 | $ 45,001

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