Quarterly report [Sections 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)

v3.25.3
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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]          
Clinics in operation at the end of the period 962 963   962 963
Clinic licenses sold but not yet developed 86 102   86 102
Future clinic licenses subject to executed letters of intent 63 46   63 46
Franchised clinics:          
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]          
Clinics open at beginning of period 885 829 842 842 800
Opened during the period 9 14   21 46
Acquired during the period 1 1   40 3
Closed during the period (11) (6)   (19) (11)
Clinics in operation at the end of the period 884 838 885 884 838
Company-owned or managed clinics: | Discontinued Operations, Held-for-Sale or Disposed of by Sale | Corporate Clinics          
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]          
Clinics open at beginning of period 82 131 125 125 135
Sold during the period (1) (1)   (40) (3)
Closed during the period (3) (5)   (7) (7)
Clinics in operation at the end of the period 78 125 82 78 125