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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable, gross | $ 3,181 | $ 4,887
Less allowance for doubtful accounts | (2,484) | (4,013)
Accounts receivable, net | 697 | 874
Medicaid [Member] |  |
Accounts receivable, gross | 45 | 131
Medicare [Member] |  |
Accounts receivable, gross | 727 | 1,054
Self-Pay [Member] |  |
Accounts receivable, gross | 139 | 276
Third-Party Payor [Member] |  |
Accounts receivable, gross | 2,111 | 3,373
Contract Diagnostic Services [Member] |  |
Accounts receivable, gross | $ 159 | $ 53

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