SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 1,482	$ 917
less allowance for doubtful accounts	(266)	(204)
Net sales	1,216	713
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	9	3
less allowance for doubtful accounts	(8)	(3)
Net sales	1
Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	524	394
less allowance for doubtful accounts	(79)	(59)
Net sales	445	335
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	50	4
Net sales	50	4
Third Party Payer [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	517	356
less allowance for doubtful accounts	(179)	(142)
Net sales	338	214
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	358	153
Net sales	358	153
Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	24	7
Net sales	24	7
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,458	910
less allowance for doubtful accounts	(266)	(204)
Net sales	1,192	706
Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 24	$ 7