Quarterly report pursuant to Section 13 or 15(d)

Nature of Operations and Summary of Significant Accounting Policies - Franchisor Disclosure (Details)

v3.21.2
Nature of Operations and Summary of Significant Accounting Policies - Franchisor Disclosure (Details) - clinic
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
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 666 560 666 560
Clinic licenses sold but not yet developed 252 178 252 178
Executed letters of intent for future clinic licenses 43 40 43 40
Franchised Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 555 477 515 453
Opened during the period 28 21 76 49
Sold during the period 0 0 (8) 0
Closed during the period 0 (1) 0 (5)
Clinics in operation at the end of the period 583 497 583 497
Company-Owned or Managed Clinics        
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward]        
Clinics open at beginning of period 78 62 64 60
Opened during the period 5 1 11 3
Acquired during the period 0 0 8 0
Closed during the period 0 0    
Clinics in operation at the end of the period 83 63 83 63