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)

v3.23.3
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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Closed during the period     (2) 0
Clinics in operation at the end of the period 914 805 914 805
Clinic licenses sold but not yet developed 155 212 155 212
Licenses for future clinics subject to executed letters of intent 42 40 42 40
Franchised Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 756 662 712 610
Opened during the period 24 33 76 91
Acquired during the period 0 1 0 1
Sold during the period 0 (4) (3) (8)
Closed during the period (2) (2) (7) (4)
Clinics in operation at the end of the period 778 690 778 690
Company-Owned or Managed Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 134 107 126 96
Opened during the period 2 5 9 12
Acquired during the period 0 4 3 8
Sold during the period 0 (1) 0 (1)
Closed during the period 0 0    
Clinics in operation at the end of the period 136 115 136 115