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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts receivable, gross | $ 3,180 | $ 3,181
Less allowance for doubtful accounts | (2,026) | (2,484)
Accounts receivable, net | 1,154 | 697
Medicaid [Member] |  |
Accounts receivable, gross | 45 | 45
Medicare [Member] |  |
Accounts receivable, gross | 963 | 727
Self-Pay [Member] |  |
Accounts receivable, gross | 229 | 139
Third-Party Payor [Member] |  |
Accounts receivable, gross | 1,596 | 2,111
Contract Diagnostic Services and Other [Member] |  |
Accounts receivable, gross | $ 347 | $ 159

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