SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Gross to Net Sales Adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Gross revenue	$ 5,149	$ 4,548	$ 10,094	$ 8,891
Contractual allowance and adjustments	(2,703)	(2,304)	(5,121)	(4,536)
Service revenue, net	2,446	2,244	4,973	4,355
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	12	18
Medicare [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	1,076	1,009
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	48	69
Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net	1,090	921
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Service revenue, net		21
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	4,929	4,342	9,352	8,518
Contractual allowance and adjustments	(2,703)	(2,304)	(5,121)	(4,536)
Service revenue, net	2,226	2,038	4,231	3,982
Service revenue, net [Member] | Medicaid [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	12	18	27	31
Service revenue, net	12	18	27	31
Service revenue, net [Member] | Medicare [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	1,076	1,009	2,050	1,993
Service revenue, net	1,076	1,009	2,050	1,993
Service revenue, net [Member] | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	48	69	97	116
Service revenue, net	48	69	97	116
Service revenue, net [Member] | Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	3,793	3,225	7,178	6,357
Contractual allowance and adjustments	(2,703)	(2,304)	(5,121)	(4,536)
Service revenue, net	1,090	921	2,057	1,821
Service revenue, net [Member] | Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Gross revenue		21		21
Service revenue, net		21		21
Other [Member]
Disaggregation of Revenue [Line Items]
Gross revenue			742	373
Service revenue, net	220	206	$ 742	$ 373
Other [Member] | Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	220	206
Service revenue, net	$ 220	$ 206