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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2021 USD ($) Clinic Location State | Jun. 30, 2021 USD ($) Clinic | Mar. 31, 2021 USD ($) Clinic | Nov. 30, 2020 USD ($) Installment Clinic | Sep. 30, 2020 USD ($) Contract Installment | Feb. 27, 2020 USD ($) Clinic Partnership | Apr. 11, 2019 State Location | Apr. 30, 2018 Business | Mar. 31, 2021 USD ($) Clinic | Sep. 30, 2021 USD ($) Clinic Location State | Sep. 30, 2020 USD ($) Contract | Sep. 30, 2021 USD ($) Location Clinic Segment Facility State | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Region | Dec. 31, 2019 Region | Mar. 31, 2017
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Percentage of general partnership interest owned |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Number of businesses acquired | Clinic |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of closed clinics sold | Clinic | 2 |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |
Aggregate sale price of clinics |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |
Number of clinics operated | Clinic | 579 |  |  |  |  |  |  |  |  | 579 |  | 579 |  |  |  |
Number of states where clinics are operated | State | 39 |  |  |  |  |  |  |  |  | 39 |  | 39 |  |  |  |
Number of third party facilities | Facility |  |  |  |  |  |  |  |  |  |  |  | 35 |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 123,580,000 | $ 106,925,000 | $ 357,578,000 | $ 299,759,000 |  |  |
Deferment of depositing employer's share social security taxes included in accrued liabilities | $ 4,100,000 |  |  |  |  |  |  |  |  | 4,100,000 |  | 4,100,000 |  |  |  |
Deferment of depositing employer's share social security taxes other long-term liabilities | 4,200,000 |  |  |  |  |  |  |  |  | 4,200,000 |  | 4,200,000 |  |  |  |
Relief funds |  |  |  |  |  |  |  |  |  | 0 | 390,000 | 0 | 8,349,000 |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long lived assets to be disposed of |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of regions | Region |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 6 |
Derecognition (write-off) of goodwill - closed clinics |  |  |  |  |  |  |  |  |  | 0 | $ 0 | 0 | $ 1,859,000 | $ 1,859,000 |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Accrued interest and penalties associated with any unrecognized tax benefits | 0 |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |
Interest expense recognized |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Medicare Accelerated and Advance Payments Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of funds | 14,100,000 |  |  |  |  |  |  |  |  | 14,100,000 |  | $ 14,100,000 |  |  |  |
Public Health and Social Services Emergency Fund [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants and other funds | 100,000,000,000.0 |  |  |  |  |  |  |  |  | 100,000,000,000.0 |  | 100,000,000,000.0 |  |  |  |
Funds received | 13,500,000 |  |  |  |  |  |  |  |  | 13,500,000 |  | 13,500,000 |  |  |  |
Relief funds |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 65.00% | 70.00% | 75.00% |  | 65.00% |  |  | 70.00% |  |  |  |  |  |  |
Number of businesses acquired | Clinic |  | 8 | 5 | 3 |  | 4 |  |  | 5 |  |  |  |  |  |  |
Percentage of interest the founder will retain |  | 35.00% | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Aggregate purchase price for the acquisition |  | $ 10,300,000 | $ 12,000,000.0 | $ 8,900,000 |  | $ 11,900,000 |  |  | $ 12,000,000.0 |  |  |  |  |  |  |
Cash paid for acquisition |  | 9,000,000.0 | 11,700,000 | 8,600,000 |  | 11,600,000 |  |  | 11,700,000 |  |  |  |  |  |  |
Payable for achievement of certain business criteria |  | 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes |  | $ 300,000 | $ 300,000 | $ 300,000 |  | $ 300,000 |  |  | $ 300,000 |  |  |  |  |  |  |
Percentage of interest accrued |  | 3.25% | 3.25% | 3.25% |  | 4.75% |  |  | 3.25% |  |  |  |  |  |  |
Contingent payment consideration |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | Installment |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Principal installments |  |  |  | $ 162,500 |  |  |  |  |  |  |  |  |  |  |  |
Number of partnerships | Partnership |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
IIPS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  | 100.00% | 65.00% |  |  |  |  |  |  |  | 55.00%
Number of businesses merged | Business |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Percentage of combined business interest owned |  |  |  |  |  |  | 76.00% | 59.45% |  |  |  |  |  |  |  |
Number of states of network services | State |  |  |  |  |  |  | 45 |  |  |  |  |  |  |  |  |
Number of onsite client locations | Location |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |
Management Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  | 70.00% |  |  |  |  |  | 70.00% |  | 70.00% |  |  |
Aggregate purchase price for the acquisition |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  |  |  | $ 500,000 |  |  |  |  |  | $ 500,000 |  | $ 500,000 |  |  |
Number of installments | Installment |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Number of management contracts | Contract |  |  |  |  | 6 |  |  |  |  |  | 6 |  |  |  |  |
Management Contracts [Member] | Notes Payable One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Management Contracts [Member] | Notes Payable Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes | 200,000 |  |  |  |  |  |  |  |  | 200,000 |  | 200,000 |  |  |  |
Return-to-work and Ergonomic Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price for the acquisition | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes | $ 300,000 |  |  |  |  |  |  |  |  | $ 300,000 |  | $ 300,000 |  |  |  |
Percentage of interest accrued | 3.25% |  |  |  |  |  |  |  |  | 3.25% |  | 3.25% |  |  |  |
Contingent payment consideration | $ 600,000 |  |  |  |  |  |  |  |  | $ 600,000 |  | $ 600,000 |  |  |  |
Asset purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |
Briotix Health [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of combined business interest owned | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |
Redeemable Non-Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Minimum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Minimum [Member] | Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Minimum [Member] | Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Return-to-work and Ergonomic Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  |  |  |  |  |  |  |  |  |  | 99.00% |  |  |  |
Number of operating clinic locations | Location | 1 |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |
Redeemable Non-Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Maximum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |
Maximum [Member] | Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Maximum [Member] | Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  | 83.80% |  |  |  |  |  |  |  |  |  |

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