Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting - Narrative (Details)

v3.21.2
Segment Reporting - Narrative (Details)
6 Months Ended
Jun. 30, 2021
clinic
segment
Mar. 31, 2021
clinic
Dec. 31, 2020
clinic
Jun. 30, 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 633     539    
Company-owned or Managed Clinics            
Segment Reporting Information [Line Items]            
Number of Stores 78 65 64 62 61 60
Franchised Clinics            
Segment Reporting Information [Line Items]            
Number of Stores 555 527 515 477 469 453