Quarterly report pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES (Details)

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SIGNIFICANT ACCOUNTING POLICIES (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sales Revenue, Net [Member] | Medicare        
Concentration of Risk Percentage 34.50% 33.50% 35.20% 34.00%
Sales Revenue, Net [Member] | Commercial Payor 1        
Concentration of Risk Percentage 16.50% 20.50% 16.20% 19.70%
Sales Revenue, Net [Member] | Commercial Payor 2        
Concentration of Risk Percentage 11.20% 0.00% 10.40% 10.00%
Accounts Receivable [Member] | Medicare        
Concentration of Risk Percentage     24.00% 34.60%
Accounts Receivable [Member] | Commercial Payor 1        
Concentration of Risk Percentage     10.60% 15.50%
Accounts Receivable [Member] | Commercial Payor 2        
Concentration of Risk Percentage     13.40% 12.50%