SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 1,645	$ 1,199	$ 3,127	$ 2,116
less allowance for doubtful accounts	(337)	(257)	(603)	(461)
Net sales	1,308	942	2,524	1,655
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	16	9	25	12
less allowance for doubtful accounts	(16)	(9)	(24)	(12)
Net sales			1
Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	643	450	1,168	844
less allowance for doubtful accounts	(97)	(68)	(175)	(127)
Net sales	546	382	993	717
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	86	11	136	15
Net sales	86	11	136	15
Third Party Payer [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	847	451	1,363	807
less allowance for doubtful accounts	(224)	(180)	(404)	(322)
Net sales	623	271	959	485
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	24	274	382	427
Net sales	24	274	382	427
Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	29	4	53	11
Net sales	29	4	53	11
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,616	1,195	3,074	2,105
less allowance for doubtful accounts	(337)	(257)	(603)	(461)
Net sales	$ 1,279	$ 938	$ 2,471	$ 1,644