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Revenue - Schedule of Revenues Disaggregated by Revenue Source (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Dec. 31, 2022
Disaggregation Of Revenue [Line Items]            
Revenues, net $ 214,871 $ 222,903 $ 249,718 $ 683,594 $ 816,932 $ 1,039,835
Digital Subscription Revenues            
Disaggregation Of Revenue [Line Items]            
Revenues, net 140,889   155,881 437,613 521,582  
Workshops + Digital Fees            
Disaggregation Of Revenue [Line Items]            
Revenues, net 52,618   64,865 171,473 196,540  
Clinical Subscription Revenues            
Disaggregation Of Revenue [Line Items]            
Revenues, net 9,989     17,581    
Subscription Revenues, net            
Disaggregation Of Revenue [Line Items]            
Revenues, net 203,496   220,746 626,667 718,122  
Product sales and other, net            
Disaggregation Of Revenue [Line Items]            
Revenues, net $ 11,375   $ 28,972 $ 56,927 $ 98,810