Quarterly report pursuant to Section 13 or 15(d)

Nature of Operations and Summary of Significant Accounting Policies - Clinics in Operation Under Franchise Agreements or Company-owned or Managed (Details)

v3.23.1
Nature of Operations and Summary of Significant Accounting Policies - Clinics in Operation Under Franchise Agreements or Company-owned or Managed (Details) - clinic
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]    
Clinics in operation at the end of the period 870 736
Clinic licenses sold but not yet developed 178 239
Future clinic licenses subject to executed letters of intent 39 39
Franchised Clinics    
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]    
Clinics open at beginning of period 712 610
Opened during the period 29 27
Sold during the period 0 0
Closed during the period (1) (1)
Clinics in operation at the end of the period 740 636
Company-Owned or Managed Clinics    
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]    
Clinics open at beginning of period 126 96
Opened during the period 4 4
Acquired during the period 0 0
Closed during the period 0 0
Clinics in operation at the end of the period 130 100