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)

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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, 2024
Mar. 31, 2023
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]    
Clinics in operation at the end of the period 954 870
Clinic licenses sold but not yet developed 117 178
Future clinic licenses subject to executed letters of intent 46 39
Franchised Clinics    
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]    
Clinics open at beginning of period 800 712
Opened during the period 23 29
Sold during the period 0 0
Acquired during the period 0 0
Closed during the period (4) (1)
Clinics in operation at the end of the period 819 740
Company-Owned or Managed Clinics    
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]    
Clinics open at beginning of period 135 126
Opened during the period 0 4
Sold during the period 0 0
Acquired during the period 0 0
Closed during the period 0 0
Clinics in operation at the end of the period 135 130