Quarterly report pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES (Details)

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SIGNIFICANT ACCOUNTING POLICIES (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue Concentration:        
Medicare 31.20% 33.80% 32.70% 35.70%
Commercial Payor 1 17.40% 18.00% 16.60% 18.40%
Commercial Payor 2 0.00% 10.70% 0.00% 11.60%
Receivable Concentration:        
Medicare     24.40% 20.60%
Commercial Payor 1     0.00% 15.30%
Commercial Payor 2     13.10% 13.80%