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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Allowance for doubtful accounts, Beginning balance |  |  | $ (1,127) |
Allowances for doubtful accounts | $ (173) | $ (57) | (399) | $ (168)
Bad debt expense |  |  | 5 |
Total charges |  |  | (394) |
Allowance for doubtful accounts, Ending balance | (1,521) |  | (1,521) |
Medicaid [Member] |  |  |  |
Allowances for doubtful accounts | (15) | (1) | (38) | (5)
Medicare [Member] |  |  |  |
Allowances for doubtful accounts | (43) | (30) | (105) | (83)
Self-Pay [Member] |  |  |  |
Allowances for doubtful accounts |  | (6) |  | (16)
Third-Party Payor [Member] |  |  |  |
Allowances for doubtful accounts | $ (115) | $ (20) | $ (256) | $ (64)

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The aggregate selling price reductions recognized during an accounting period due to the rendering of deficient or nonconforming services. Allowances are a deduction from gross revenue in arriving at net revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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