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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) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 clinic license | Jun. 30, 2025 clinic license | Jun. 30, 2026 clinic license | Jun. 30, 2025 clinic license
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward] |  |  |  |
Clinics in operation at the end of the period | 941 | 967 | 941 | 967
Clinic licenses sold but not yet developed at the end of the period | license | 52 | 92 | 52 | 92
Future clinic licenses subject to executed letters of intent at the end of the period | license | 58 | 60 | 58 | 60
Franchised Clinics |  |  |  |
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward] |  |  |  |
Clinics open at the beginning of the period | 868 | 847 | 885 | 842
Opened during the period | 5 | 7 | 8 | 12
Acquired during the period | 29 | 37 | 29 | 39
Closed during the period | (6) | (6) | (26) | (8)
Clinics in operation at the end of the period | 896 | 885 | 896 | 885
Company-owned or managed clinics: | Discontinued Operations, Held-for-Sale or Disposed of by Sale | Corporate Clinics |  |  |  |
Product Information, Franchised Clinics, Company-Owned Or Managed Clinics, Activity [Roll Forward] |  |  |  |
Clinics open at the beginning of the period | 75 | 122 | 75 | 125
Sold during the period | (29) | (37) | (29) | (39)
Closed during the period | (1) | (3) | (1) | (4)
Clinics in operation at the end of the period | 45 | 82 | 45 | 82

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- Definition Clinic Licenses Sold But Not Yet Developed + References No definition available. + Details
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- Definition Clinics Closed During The Period + References No definition available. + Details
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- Definition Clinics Sold During Period + References No definition available. + Details
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- Definition Future Clinic Licenses With Executed Letters Of Intent + References No definition available. + Details
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- Definition Represents the number of stores. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-2 + Details
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