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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable, gross | $ 1,852 | $ 4,887
Less allowance for doubtful accounts | (1,409) | (4,013)
Accounts receivable, net | 443 | 874
Medicaid [Member] |  |
Accounts receivable, gross | 27 | 131
Medicare [Member] |  |
Accounts receivable, gross | 435 | 1,054
Self-Pay [Member] |  |
Accounts receivable, gross | 64 | 276
Third Party Payers [Member] |  |
Accounts receivable, gross | 1,193 | 3,373
Contract Diagnostic Services and Other [Member] |  |
Accounts receivable, gross | $ 133 | $ 53

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