0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Condensed Consolidated Statements Of Operations link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Revenue Disclosures link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Divestitures link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Property and Equipment link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Stock-Based Compensation link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Segment Reporting link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Related ​Party​ Transactions link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Revenue Disclosures (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Divestitures (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Property and Equipment (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Stock-Based Compensation  (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Commitments and Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Segment Reporting (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Clinics in Operation Under Franchise Agreements or Company-owned or Managed (Details) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - VIE Net Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - VIE Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Impairment Losses and Disposal Gains and Losses Recorded in Income from Discontinued Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Earnings (Loss) Per Common Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Revenue Disclosures - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Revenue Disclosures - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Revenue Disclosures - Rollforward of Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Revenue Disclosures - Rollforward of Contract Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Revenue Disclosures - Rollforward of Deferred Franchise and Development Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Revenue Disclosures - Estimated Revenue Related to Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Revenue Disclosures - Estimated Revenue Related to Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Divestitures - Key Components of Net Income (Loss) from Discontinued Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Divestitures - Assets and Liabilities of Discontinued Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Divestitures - Key Components of Cash Flows from Discontinued Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Divestitures - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Divestitures - Held For Sale Assets and Liabilities To Be Disposed of (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Stockholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Stock-Based Compensation - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Stock-Based Compensation - Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Stock-Based Compensation - Restricted Stock Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Commitments and Contingencies - Lease Expense and Supplemental Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Commitments and Contingencies - Maturities of Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Commitments and Contingencies - Maturities of Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Commitments and Contingencies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Segment Reporting - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Segment Reporting - Total Revenue and Significant Expense Categories (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Related ​Party​ Transactions (Details) link:presentationLink link:calculationLink link:definitionLink