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NET SALES SERVICE REVENUE AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Allowance for doubtful accounts, Beginning balance |  |  | $ (1,127) |
Allowances for dubtful accounts | $ (142) | $ (56) | (226) | $ (111)
Bad debt expense |  |  | 2 |
Total charges |  |  | (224) |
Allowance for doubtful accounts, Ending balance | (1,351) |  | (1,351) |
Medicaid [Member] |  |  |  |
Allowances for dubtful accounts | (12) | (2) | (23) | (4)
Medicare [Member] |  |  |  |
Allowances for dubtful accounts | (42) | (23) | (62) | (53)
Self-Pay [Member] |  |  |  |
Allowances for dubtful accounts |  | (6) |  | (10)
Third-Party Payor [Member] |  |  |  |
Allowances for dubtful accounts | $ (88) | $ (25) | $ (141) | $ (44)

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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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