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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Closed during the period     0 0
Clinics in operation at the end of the period 769 633 769 633
Clinic licenses sold but not yet developed 229 247 229 247
Licenses for future clinics subject to executed letters of intent 41 35 41 35
Franchised Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 636 527 610 515
Opened during the period 31 36 58 48
Sold during the period (4) (8) (4) (8)
Closed during the period (1) 0 (2) 0
Clinics in operation at the end of the period 662 555 662 555
Company-Owned or Managed Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 100 65 96 64
Opened during the period 3 5 7 6
Acquired during the period 4 8 4 8
Closed during the period 0 0    
Clinics in operation at the end of the period 107 78 107 78