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ACQUISITIONS OF BUSINESSES (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) Clinic | Mar. 31, 2021 USD ($) Clinic | Nov. 30, 2020 USD ($) Installment Clinic | Sep. 30, 2020 USD ($) Contract Installment | Feb. 27, 2020 USD ($) Clinic Partnership | Mar. 31, 2021 USD ($) Clinic | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) Contract | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Annual revenue |  |  |  |  |  |  |  | $ 123,580,000 | $ 106,925,000 | $ 357,578,000 | $ 299,759,000 |
Number of clinics | Clinic |  | 8 |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 22,589,000 | $ 15,322,000 |
Referral Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  |  | 12 years |  | 13 years
Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  |  | 6 years |  | 6 years
Return-to-work and Ergonomic Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price for the acquisition | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |
Contingent payment consideration | 600,000 |  |  |  |  |  |  | $ 600,000 |  | $ 600,000 |  |
Cash paid for acquisition | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of interest accrued | 3.25% |  |  |  |  |  |  | 3.25% |  | 3.25% |  |
Seller notes | $ 300,000 |  |  |  |  |  |  | $ 300,000 |  | $ 300,000 |  |
Return-to-work and Ergonomic Services [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Annual revenue |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0
Management Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  | 70.00% |  |  |  | 70.00% |  | 70.00% |
Number of management contracts | Contract |  |  |  |  | 6 |  |  |  | 6 |  |  |
Aggregate purchase price for the acquisition |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  | $ 3,700,000 |  |  |  |  |  |  |
Number of installments | Installment |  |  |  |  | 2 |  |  |  |  |  |  |
Seller notes |  |  |  |  | $ 500,000 |  |  |  | $ 500,000 |  | $ 500,000 |
Management Contracts [Member] | Notes Payable One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  |  | $ 300,000 |  |  |  |  |  |  |  |
Management Contracts [Member] | Notes Payable Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Seller notes | 200,000 |  |  |  |  |  |  | 200,000 |  | 200,000 |  |
Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 65.00% | 70.00% | 75.00% |  | 65.00% | 70.00% |  |  |  |  |
Percentage of interest retained by practice founder |  | 35.00% | 30.00% |  |  |  | 30.00% |  |  |  |  |
Number of clinics | Clinic |  | 8 | 5 | 3 |  | 4 | 5 |  |  |  |  |
Aggregate purchase price for the acquisition |  | $ 10,300,000 | $ 12,000,000.0 | $ 8,900,000 |  | $ 11,900,000 | $ 12,000,000.0 |  |  |  |  |
Contingent payment consideration |  | 800,000 |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  | $ 9,000,000.0 | $ 11,700,000 | $ 8,600,000 |  | $ 11,600,000 | $ 11,700,000 |  |  |  |  |
Number of installments | Installment |  |  |  | 2 |  |  |  |  |  |  |  |
Principal installments |  |  |  | $ 162,500 |  |  |  |  |  |  |  |
Number of partnerships in which interest acquired | Partnership |  |  |  |  |  | 4 |  |  |  |  |  |
Percentage of interest accrued |  | 3.25% | 3.25% | 3.25% |  | 4.75% | 3.25% |  |  |  |  |
Seller notes |  | $ 300,000 | $ 300,000 | $ 300,000 |  | $ 300,000 | $ 300,000 |  |  |  |  |
Payable |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |
Clinic Practice [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  | 10.00% |  |  |  |  |  |
Clinic Practice [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  | 83.80% |  |  |  |  |  |
Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  |  |  | 22,589,000 |  | 23,911,000
Seller notes | 800,000 |  |  |  |  |  |  | 800,000 |  | 800,000 |  | 1,121,000
Payable | 1,000,000 |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  |
Total consideration | 24,389,000 |  |  |  |  |  |  | 24,389,000 |  | 24,389,000 |  | 25,032,000
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total current assets | 1,194,000 |  |  |  |  |  |  | 1,194,000 |  | 1,194,000 |  | 1,271,000
Total non-current assets | 6,547,000 |  |  |  |  |  |  | 6,547,000 |  | 6,547,000 |  | 196,000
Total liabilities | (7,559,000) |  |  |  |  |  |  | (7,559,000) |  | (7,559,000) |  | (556,000)
Net tangible assets acquired | 182,000 |  |  |  |  |  |  | 182,000 |  | 182,000 |  | 911,000
Referral relationships | 3,424,000 |  |  |  |  |  |  | 3,424,000 |  | 3,424,000 |  | 5,520,000
Non-compete | 562,000 |  |  |  |  |  |  | 562,000 |  | 562,000 |  | 500,000
Tradename | 1,577,000 |  |  |  |  |  |  | 1,577,000 |  | 1,577,000 |  | 1,890,000
Goodwill | 29,363,000 |  |  |  |  |  |  | 29,363,000 |  | 29,363,000 |  | 27,509,000
Fair value of non-controlling interest (classified as redeemable non-controlling interest) | (10,719,000) |  |  |  |  |  |  | (10,719,000) |  | (10,719,000) |  | (11,298,000)
Total consideration | $ 24,389,000 |  |  |  |  |  |  | $ 24,389,000 |  | $ 24,389,000 |  | $ 25,032,000

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- Definition The amount of business acquisition cost of acquired entity debt issued on the date of acquisition. + References No definition available. + Details
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- Definition Business acquisition number of installments for payment of purchase consideration. + References No definition available. + Details
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- Definition Percentage of voting equity interests retained by practice founder at the acquisition date in the business combination. + References No definition available. + Details
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- Definition Amount of net tangible asset acquired at the acquisition date. + References No definition available. + Details
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- Definition Useful life of acquired finite-lived intangible assets in business combination, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition This element represents the fair value of the redeemable noncontrolling interest in the acquiree at the acquisition date. + References No definition available. + Details
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- Definition The amount of non-competition agreements recognized as of the acquisition date. + References No definition available. + Details
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- Definition Amount of referral relationships at the acquisition date. + References No definition available. + Details
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- Definition The amount of tradename recognized as of the acquisition date. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The number of management contracts during period. + References No definition available. + Details
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- Definition Number of partnership in which interest acquired during the period. + References No definition available. + Details
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- Definition Payments to acquire businesses total consideration. + References No definition available. + Details
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