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NET SALES SERVICE REVENUE AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts Receivable, Gross | $ 1,857 | $ 1,198
Less allowance for doubtful accounts | (1,127) | (810)
Accounts receivable, net | 730 | 388
Medicaid [Member] |  |
Accounts Receivable, Gross | 37 | 22
Medicare [Member] |  |
Accounts Receivable, Gross | 256 | 232
Self-Pay [Member] |  |
Accounts Receivable, Gross | 53 | 63
Third party payers [Member] |  |
Accounts Receivable, Gross | 1,066 | $ 881
Contract diagnostic services [Member] |  |
Accounts Receivable, Gross | $ 445 |

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