Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting - Narrative (Details)

v3.21.1
Segment Reporting - Narrative (Details)
3 Months Ended
Mar. 31, 2021
segment
clinic
Dec. 31, 2020
clinic
Mar. 31, 2020
clinic
Dec. 31, 2019
clinic
Segment Reporting Information [Line Items]        
Number of operating segments | segment 2      
Number of non-operating segments | segment 1      
Number of Stores 592   530  
Company-owned or Managed Clinics        
Segment Reporting Information [Line Items]        
Number of Stores 65 64 61 60
Franchised Clinics        
Segment Reporting Information [Line Items]        
Number of Stores 527 515 469 453