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Revenue - Schedule of Revenues Disaggregated by Revenue Source (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 28, 2024	Jun. 24, 2025	Sep. 28, 2024
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 184,258	$ 172,091	$ 192,887	$ 363,568	$ 601,508
Behavioral Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net	155,497	145,152	172,194	302,636	537,731
Clinical Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net	27,510	25,777	19,054	58,317	57,529
Subscription Revenues, net
Disaggregation Of Revenue [Line Items]
Revenues, net	183,007	170,929	191,248	360,953	595,260
Other Revenues, net
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 1,251	$ 1,162	$ 1,639	$ 2,615	$ 6,248

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