ACQUISITIONS OF BUSINESSES (Details) $ in Thousands					1 Months Ended	6 Months Ended		12 Months Ended
	Apr. 11, 2019 USD ($) State Location	Aug. 31, 2018 USD ($) Installment Clinic	Apr. 30, 2018 USD ($) Business	Feb. 28, 2018 Clinic	Mar. 31, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) Clinic
Business Combination, Description [Abstract]
Number of clinics | Clinic		4		2				5
Cash paid, net of cash acquired			$ 16,367			$ 18,239	$ 9,118
Seller notes			950
Total consideration			17,317
Estimated fair value of net tangible assets acquired [Abstract]
Total current assets			1,691
Total non-current assets			305
Total liabilities			(524)
Net tangible assets acquired			1,472
Referral relationships			2,294
Non-compete			328
Tradename			1,297
Goodwill			20,071
Fair value of non-controlling interest (classified as redeemable non-controlling interests)			(8,145)
Total consideration			$ 17,317
Referral Relationships [Member]
Estimated fair value of net tangible assets acquired [Abstract]
Estimated useful lives of acquired intangibles						11 years		10 years 6 months 14 days
Non-compete Agreements [Member]
Estimated fair value of net tangible assets acquired [Abstract]
Estimated useful lives of acquired intangibles						6 years		6 years
April 2019 Acquisition [Member]
Business Combination, Description [Abstract]
Acquisition date						Apr. 11, 2019
Number of states of network services | State	45
Number of onsite client locations | Location	11
Percentage of interest acquired	76.00%
Cash paid for acquisition of interest in clinic	$ 19,600
Aggregate purchase price for the acquired clinic practices	$ 23,600
Percentage of interest accrued	5.50%
Cash paid, net of cash acquired	$ 18,239
Payable to shareholders of seller	500
Seller notes	4,000
Total consideration	22,741
Estimated fair value of net tangible assets acquired [Abstract]
Total current assets	1,588
Total non-current assets	38
Total liabilities	(477)
Net tangible assets acquired	1,149
Referral relationships	1,500
Non-compete	590
Tradename	2,500
Goodwill	17,002
Total consideration	$ 22,741
August 2018 Acquisition [Member]
Business Combination, Description [Abstract]
Acquisition date						Aug. 31, 2018
Percentage of interest acquired		70.00%
Number of clinics | Clinic		4
Cash paid for acquisition of interest in clinic		$ 7,200
Business acquisition number of installments to payment of purchase consideration | Installment		2
Seller notes		$ 400
August 2018 Acquisition [Member] | August 2019 [Member]
Business Combination, Description [Abstract]
Acquisition cost payable in two principal installments including accrued interest		200
August 2018 Acquisition [Member] | August 2020 [Member]
Business Combination, Description [Abstract]
Acquisition cost payable in two principal installments including accrued interest		$ 200
Industrial Injury Prevention [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired			65.00%		55.00%
Cash paid for acquisition of interest in clinic			$ 8,600		$ 6,200
Number of businesses merged | Business			2
Percentage of combined business interest owned			59.45%
Seller notes			$ 400		$ 400
Acquisition of Five Clinic Practices [Member]
Business Combination, Description [Abstract]
Number of clinics | Clinic								5
Cash paid for acquisition of interest in clinic								$ 1,000
Aggregate purchase price for the acquired clinic practices								850
Seller notes								$ 150
Acquisition of Five Clinic Practices [Member] | August 2019 [Member]
Business Combination, Description [Abstract]
Percentage of interest accrued								4.50%