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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 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 890 769 890 769
Clinic licenses sold but not yet developed 171 229 171 229
Licenses for future clinics subject to executed letters of intent 43 41 43 41
Franchised Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 740 636 712 610
Opened during the period 23 31 52 58
Sold during the period (3) (4) (3) (4)
Closed during the period (4) (1) (5) (2)
Clinics in operation at the end of the period 756 662 756 662
Company-Owned or Managed Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 130 100 126 96
Opened during the period 3 3 7 7
Acquired during the period 3 4 3 4
Closed during the period (2) 0    
Clinics in operation at the end of the period 134 107 134 107