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ACQUISITIONS OF BUSINESSES (Details) |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) Clinic Installment | Apr. 30, 2018 USD ($) Business | Feb. 28, 2018 USD ($) Clinic | Oct. 31, 2017 USD ($) Clinic Contract Installment | Jun. 30, 2017 USD ($) Clinic Installment | May 31, 2017 USD ($) Clinic Installment | Mar. 23, 2017 USD ($) | Jan. 01, 2017 USD ($) Clinic Installment | Sep. 30, 2018 USD ($) Clinic | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Clinic | Dec. 31, 2016 USD ($)
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic | 4 |  | 2 |  |  |  |  |  | 2 |  | 2 |
Number of clinics consolidated with an existing clinic | Clinic |  |  |  |  |  |  |  |  |  |  | 1 |
Number of clinics that operate as a satellite clinic with existing partnerships | Clinic |  |  |  |  |  |  |  |  |  |  | 1 |
Seller notes issued for acquisition of interest in clinic |  | $ 950,000 |  |  |  |  |  |  |  |  | $ 2,150,000 |
Cash paid, net of cash acquired |  | 16,303,000 |  |  |  |  |  |  | $ 16,303,000 | $ 33,740,000 | 36,682,000 |
Seller notes |  | 950,000 |  |  |  |  |  |  |  |  | 2,150,000 |
Total consideration |  | 17,253,000 |  |  |  |  |  |  |  |  | 38,832,000 |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  | 1,691,000 |  |  |  |  |  |  |  |  | 5,850,000 |
Total non-current assets |  | 29,000 |  |  |  |  |  |  |  |  | 1,434,000 |
Total liabilities |  | (247,000) |  |  |  |  |  |  |  |  | (2,974,000) |
Net tangible assets acquired |  | 1,473,000 |  |  |  |  |  |  |  |  | 4,310,000 |
Referral relationships |  | 1,879,000 |  |  |  |  |  |  |  |  | 4,612,000 |
Non-compete |  | 386,000 |  |  |  |  |  |  |  |  | 736,000 |
Tradename |  | 2,172,000 |  |  |  |  |  |  |  |  | 6,228,000 |
Goodwill |  | 19,488,000 |  |  |  |  |  |  |  |  | 47,111,000 |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) |  | (8,145,000) |  |  |  |  |  |  |  |  | (13,883,000) |
Fair value of non-controlling interest (originally classified as mandatorily redeemable non-controlling interests) |  |  |  |  |  |  |  |  |  |  | (10,282,000) |
Total consideration |  | $ 17,253,000 |  |  |  |  |  |  |  |  | $ 38,832,000 |
Referral Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  | 7 years 6 months |  |  |
Referral Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  | 12 years |  |  |
Non-compete Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  | 5 years |  |  |
Non-compete Agreements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  | 6 years |  |  |
Acquisition Of Two Clinic Practices [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  | 2 |  |  |  |  |  |  |  |  |
Acquisition Of Two Clinic Practices [Member] | August 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  | $ 760,000 |  |  |  |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  | 150,000 |  |  |  |  |  |  |  |  |
Seller notes |  |  | $ 150,000 |  |  |  |  |  |  |  |  |
Physical Therapy Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic | 4 |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired | 70.00% |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisition number of installments to payment of purchase consideration | Installment | 2 |  |  |  |  |  |  |  |  |  |  |
Seller notes | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
Physical Therapy Practice [Member] | August 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | 200,000 |  |  |  |  |  |  |  |  |  |  |
Physical Therapy Practice [Member] | August 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | 200,000 |  |  |  |  |  |  |  |  |  |  |
Industrial Injury Prevention [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 65.00% |  |  |  |  | 55.00% |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  | $ 6,200,000 |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  |  |  |  | 400,000 |  |  |  |  |
Number of businesses merged | Business |  | 2 |  |  |  |  |  |  |  |  |  |
Percentage of combined business interest owned |  | 59.45% |  |  |  |  |  |  |  |  |  |
Seller notes |  |  |  |  |  |  | $ 400,000 |  |  |  |  |
Industrial Injury Prevention [Member] | August 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | 200,000 |  |  |  |  |  |  |  |  |  |  |
Industrial Injury Prevention [Member] | August 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Industrial Injury Prevention [Member] | April 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  | $ 8,600,000 |  |  |  |  |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  | 400,000 |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  | 200,000 |  |  |  |  |  |  |  |  |  |
Seller notes |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Acquisition of Seventeen Clinic Practices [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  |  |  | 17 |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  |  |  | 70.00%
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  |  | $ 10,700,000 |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  |  |  |  |  |  |  |  |  | $ 500,000
Business acquisition number of installments to payment of purchase consideration | Installment |  |  |  |  |  |  |  | 2 |  |  |  |
Seller notes |  |  |  |  |  |  |  |  |  |  |  | $ 500,000
Acquisition of Seventeen Clinic Practices [Member] | January 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  | $ 250,000 |  |  |  |
Acquisition of Seventeen Clinic Practices [Member] | January 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  | $ 250,000 |  |  |  |
Acquisition Of Four Clinic Practices [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  | 4 |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  | 70.00% |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  |  |  | $ 250,000 |  |  |  |  |  |
Business acquisition number of installments to payment of purchase consideration | Installment |  |  |  |  |  | 2 |  |  |  |  |  |
Seller notes |  |  |  |  |  | $ 250,000 |  |  |  |  |  |
Acquisition Of Four Clinic Practices [Member] | May 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  | 125,000 |  |  |  |  |  |
Acquisition Of Four Clinic Practices [Member] | May 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  | $ 125,000 |  |  |  |  |  |
Acquisition Of Nine Clinic Practices [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  | 9 | 9 |  |  |  |  |  |  |
Number of management contracts | Contract |  |  |  | 2 |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  | 70.00% | 60.00% |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  | $ 4,000,000 | $ 15,800,000 |  |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  | $ 500,000 | $ 500,000 |  |  |  |  |  |  |
Business acquisition number of installments to payment of purchase consideration | Installment |  |  |  | 2 | 2 |  |  |  |  |  |  |
Seller notes |  |  |  | $ 500,000 | $ 500,000 |  |  |  |  |  |  |
Acquisition Of Nine Clinic Practices [Member] | June 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  | 250,000 |  |  |  |  |  |  |
Acquisition Of Nine Clinic Practices [Member] | June 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  | $ 250,000 |  |  |  |  |  |  |
Acquisition Of Nine Clinic Practices [Member] | October 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  | 250,000 |  |  |  |  |  |  |  |
Acquisition Of Nine Clinic Practices [Member] | October 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  | $ 250,000 |  |  |  |  |  |  |  |

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- Definition Amount of referral relationships at the acquisition date. + References No definition available. + Details
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