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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable, gross | $ 3,054 | $ 2,398
Less allowance for doubtful accounts | (2,171) | (1,708)
Accounts receivable, net | 883 | 690
Medicaid [Member] |  |
Accounts receivable, gross | 90 | 82
Medicare [Member] |  |
Accounts receivable, gross | 770 | 633
Self-Pay [Member] |  |
Accounts receivable, gross | 73 | 108
Third Party Payer [Member] |  |
Accounts receivable, gross | 1,852 | 1,382
Contract Diagnostic Services [Member] |  |
Accounts receivable, gross | 269 | 193
Clinical Research Grants and Other [Member] |  |
Accounts receivable, gross | $ 0 | $ 0

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