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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accounts receivable, gross $ 4,785 $ 3,248
Less allowance for doubtful accounts (3,699) (2,674)
Accounts receivable, net 1,086 574
Medicaid [Member]    
Accounts receivable, gross 132 107
Medicare [Member]    
Accounts receivable, gross 1,002 814
Self-Pay [Member]    
Accounts receivable, gross 403 88
Third Party Payer [Member]    
Accounts receivable, gross 3,211 2,203
Contract Diagnostic Services [Member]    
Accounts receivable, gross $ 37 $ 36