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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts receivable, gross | $ 3,240 | $ 3,181
Less allowance for doubtful accounts | (2,113) | (2,484)
Accounts receivable, net | 1,127 | 697
Medicaid [Member] |  |
Accounts receivable, gross | 38 | 45
Medicare [Member] |  |
Accounts receivable, gross | 1,051 | 727
Self-Pay [Member] |  |
Accounts receivable, gross | 212 | 139
Third-Party Payor [Member] |  |
Accounts receivable, gross | 1,683 | 2,111
Contract Diagnostic Services and Other [Member] |  |
Accounts receivable, gross | $ 256 | $ 159

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