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