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Revenues - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023	Dec. 29, 2023
Revenue from Contract with Customer [Abstract]
Contract assets	$ 1,469		$ 1,469		$ 1,321
Contract liabilities:
Current portion	3,443		3,443		5,406
Long-term portion	4,420		4,420		5,524
Total contract liabilities	7,863		7,863		$ 10,930
Disaggregation of Revenue [Line Items]
Contract revenue recognized, including revenue from deferred revenue beginning balance			3,000	$ 3,600
Ipsen, Takeda, Daiichi Sankyo and Genentech Collaborations
Disaggregation of Revenue [Line Items]
Revenues recognized for performance obligations satisfied in previous periods	195,400	$ 53,900	241,300	$ 91,900
Ipsen And Takeda Collaborations
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 47,800		$ 47,800

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