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Revenue - Schedule of Revenues Disaggregated by Revenue Source and Segment (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
North America            
Disaggregation Of Revenue [Line Items]            
Revenues, net 154,687   176,469 487,900 569,525  
International            
Disaggregation Of Revenue [Line Items]            
Revenues, net 60,184   73,249 195,694 247,407  
Digital Subscription Revenues            
Disaggregation Of Revenue [Line Items]            
Revenues, net 140,889   155,881 437,613 521,582  
Digital Subscription Revenues | North America            
Disaggregation Of Revenue [Line Items]            
Revenues, net 92,437   102,735 285,655 342,489  
Digital Subscription Revenues | International            
Disaggregation Of Revenue [Line Items]            
Revenues, net 48,452   53,146 151,958 179,093  
Workshops + Digital Fees            
Disaggregation Of Revenue [Line Items]            
Revenues, net 52,618   64,865 171,473 196,540  
Workshops + Digital Fees | North America            
Disaggregation Of Revenue [Line Items]            
Revenues, net 42,867   52,113 138,639 155,558  
Workshops + Digital Fees | International            
Disaggregation Of Revenue [Line Items]            
Revenues, net 9,751   12,752 32,834 40,982  
Clinical Subscription Revenues            
Disaggregation Of Revenue [Line Items]            
Revenues, net 9,989     17,581    
Clinical Subscription Revenues | North America            
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  
Subscription Revenues, net | North America            
Disaggregation Of Revenue [Line Items]            
Revenues, net 145,293   154,848 441,875 498,047  
Subscription Revenues, net | International            
Disaggregation Of Revenue [Line Items]            
Revenues, net 58,203   65,898 184,792 220,075  
Product sales and other, net            
Disaggregation Of Revenue [Line Items]            
Revenues, net 11,375   28,972 56,927 98,810  
Product sales and other, net | North America            
Disaggregation Of Revenue [Line Items]            
Revenues, net 9,394   21,621 46,025 71,478  
Product sales and other, net | International            
Disaggregation Of Revenue [Line Items]            
Revenues, net $ 1,981   $ 7,351 $ 10,902 $ 27,332