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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Gross to Net Sales Adjustments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Gross revenue $ 4,500 $ 4,287 $ 13,391 $ 10,810
Contractual allowance and adjustments (2,361) (2,238) (6,897) (5,634)
Service revenue, net 2,139 2,049 6,494 5,176
Medicaid [Member]        
Disaggregation of Revenue [Line Items]        
Gross revenue 4 15 35 40
Service revenue, net 4 15 35 40
Medicare [Member]        
Disaggregation of Revenue [Line Items]        
Gross revenue 942 811 2,935 1,979
Service revenue, net 942 811 2,935 1,979
Self-Pay [Member]        
Disaggregation of Revenue [Line Items]        
Gross revenue 65 196 181 335
Contractual allowance and adjustments       (3)
Service revenue, net 65 196 181 332
Third Party Payers [Member]        
Disaggregation of Revenue [Line Items]        
Gross revenue 3,313 3,188 9,670 7,944
Contractual allowance and adjustments (2,361) (2,238) (6,897) (5,631)
Service revenue, net 952 950 2,773 2,313
Contract Diagnostic Services [Member]        
Disaggregation of Revenue [Line Items]        
Gross revenue 35 26 56 408
Service revenue, net 35 26 56 408
Service revenue, net [Member]        
Disaggregation of Revenue [Line Items]        
Gross revenue 4,359 4,236 12,877 10,706
Contractual allowance and adjustments (2,361) (2,238) (6,897) (5,634)
Service revenue, net 1,998 1,998 5,980 5,072
Other [Member]        
Disaggregation of Revenue [Line Items]        
Gross revenue 141 51 514 104
Service revenue, net $ 141 $ 51 $ 514 $ 104