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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 2,049	$ 1,046	$ 5,176	$ 3,162
less allowance for doubtful accounts	(422)	(262)	(1,025)	(723)
Net sales	1,627	784	4,151	2,439
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	15	10	40	22
less allowance for doubtful accounts	(15)	(10)	(40)	(22)
Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	811	373	1,979	1,217
less allowance for doubtful accounts	(121)	(56)	(296)	(183)
Net sales	690	317	1,683	1,034
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	196	5	332	20
Net sales	196	5	332	20
Third Party Payer [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	950	490	2,313	1,297
less allowance for doubtful accounts	(286)	(196)	(689)	(518)
Net sales	664	294	1,624	779
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	26	142	408	569
Net sales	26	142	408	569
Services Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,998	1,020	5,072	3,125
Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	51	26	104	37
Net sales	51	26	104	37
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,998	1,020	5,072	3,125
less allowance for doubtful accounts	(422)	(262)	(1,025)	(723)
Net sales	$ 1,576	$ 758	$ 4,047	$ 2,402