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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Gross revenue	$ 4,778	$ 4,500	$ 14,872	$ 13,391
Contractual allowance and adjustments	(2,483)	(2,361)	(7,604)	(6,897)
Service revenue, net	2,295	2,139	7,268	6,494
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	12	4
Medicare [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	936	942
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	109	65
Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	1,003	952
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net		35
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	4,543	4,359	13,895	12,877
Contractual allowance and adjustments	(2,483)	(2,361)	(7,604)	(6,897)
Service revenue, net	2,060	1,998	6,291	5,980
Service revenue, net [Member] | Medicaid [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	12	4	39	35
Service revenue, net	12	4	39	35
Service revenue, net [Member] | Medicare [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	936	942	2,986	2,935
Service revenue, net	936	942	2,986	2,935
Service revenue, net [Member] | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	109	65	206	181
Service revenue, net	109	65	206	181
Service revenue, net [Member] | Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	3,486	3,313	10,664	9,670
Contractual allowance and adjustments	(2,483)	(2,361)	(7,604)	(6,897)
Service revenue, net	1,003	952	3,060	2,773
Service revenue, net [Member] | Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Gross revenue		35		56
Service revenue, net		35		56
Other [Member]
Disaggregation of Revenue [Line Items]
Gross revenue			977	514
Service revenue, net	235	141	$ 977	$ 514
Other [Member] | Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	235	141
Service revenue, net	$ 235	$ 141