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Acquisitions of Businesses, 2021 Acquisition (Details) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) Clinic | Nov. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) Clinic | Mar. 31, 2021 USD ($) Clinic | Nov. 30, 2020 USD ($) Clinic | Feb. 27, 2020 USD ($) Clinic | Dec. 31, 2021 USD ($) Clinic | Dec. 31, 2020 Clinic | Apr. 11, 2019 USD ($) | [1]
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  |  |  |  | 5 |  | 3 |
Previous Owners [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of retained interest by previous owners |  |  |  |  | 35.00% | 30.00% | 25.00% |  |  |  |  |
IIPS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  | 70.00% |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  |  |  |  | 3 |  |  |
Aggregate purchase price for the acquisition |  |  | $ 63,200 |  |  |  |  |  |  |  |  |
Contingent payment consideration | $ 2,520 | [1] | 2,000 |  |  |  |  |  | $ 2,520 | [1] |  |
Cash paid for acquisition |  |  | 60,700 |  |  |  |  |  |  |  |  |
Notes payable | $ 1,250 | [1] | $ 1,000 |  |  |  |  |  | $ 1,250 | [1] |  | $ 4,000
Percentage of interest accrued |  |  | 3.25% |  |  |  |  |  |  |  |  |
Remaining contract term |  |  |  |  |  |  |  |  | 5 years |  |  |
Ownership rights |  |  | $ 3,500 |  |  |  |  |  | $ 3,522 | [1] |  |
Return-to-work and Ergonomic Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price for the acquisition |  |  |  | $ 2,700 |  |  |  |  |  |  |  |
Contingent payment consideration |  |  |  | 600 |  |  |  |  |  |  |  |
Aggregate purchase price for the acquisition including contingent consideration |  |  |  | 3,300 |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  | 2,400 |  |  |  |  |  |  |  |
Notes payable |  |  |  | $ 300 |  |  |  |  |  |  |  |
Percentage of interest accrued |  |  |  | 3.25% |  |  |  |  |  |  |  |
Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired | 75.00% |  |  |  | 65.00% | 70.00% | 75.00% | 65.00% | 75.00% |  |  |
Number of clinics | Clinic | 3 |  |  |  | 8 | 5 | 3 | 4 |  |  |  |
Percentage of interest retained by practice founder | 25.00% |  |  |  |  |  |  |  | 25.00% |  |  |
Aggregate purchase price for the acquisition | $ 3,700 |  |  |  | $ 10,300 | $ 12,000 | $ 8,900 | $ 11,900 |  |  |  |
Contingent payment consideration |  |  |  |  | 800 |  |  |  |  |  |  |
Cash paid for acquisition | 3,500 |  |  |  | 9,000 | 11,700 | 8,600 | 11,600 |  |  |  |
Amount payable upon achievement of certain business criteria |  |  |  |  | 1,000 |  |  |  |  |  |  |
Notes payable | $ 200 |  |  |  | $ 300 | $ 300 | $ 300 | $ 300 | $ 200 |  |  |
Percentage of interest accrued | 3.25% |  |  |  | 3.25% | 3.25% | 3.25% | 4.75% | 3.25% |  |  |
[1] | Industrial injury prevention services

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