SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 2,829	$ 2,527
Adjustment for allowance for doubtful accounts	(12)	(80)
Net sales	2,817	2,447
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	8	15
Adjustment for allowance for doubtful accounts	(4)	(7)
Net sales	4	8
Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	880	974
Adjustment for allowance for doubtful accounts		(24)
Net sales	880	950
Self-Pay
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	80	49
Adjustment for allowance for doubtful accounts	(8)
Net sales	72	49
Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,100	967
Adjustment for allowance for doubtful accounts		(49)
Net sales	1,100	918
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	2,068	2,005
Adjustment for allowance for doubtful accounts	(12)	(80)
Net sales	2,056	1,925
Service revenue, net [Member] | Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	8	15
Service revenue, net [Member] | Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	880	974
Service revenue, net [Member] | Self-Pay
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	80	49
Service revenue, net [Member] | Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,100	967
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	761	522
Net sales	761	522
Other [Member] | Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 761	$ 522