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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, gross | $ 2,179 | $ 1,857
Less allowance for doubtful accounts | (1,521) | (1,127)
Accounts receivable, net | 658 | 730
Medicaid [Member] |  |
Accounts receivable, gross | 113 | 37
Medicare [Member] |  |
Accounts receivable, gross | 631 | 256
Self-Pay [Member] |  |
Accounts receivable, gross | 81 | 53
Third-Party Payor [Member] |  |
Accounts receivable, gross | 1,215 | 1,066
Contract Diagnostic Services [Member] |  |
Accounts receivable, gross | 139 | 445
Clinical Research Grants and Other [Member] |  |
Accounts receivable, gross |  |

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