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BUSINESS DESCRIPTION (Narrative) (Details) - USD ($)				3 Months Ended	9 Months Ended
	Apr. 02, 2021	Jun. 26, 2020	Sep. 07, 2018	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Apr. 30, 2020	Apr. 13, 2020
Business Acquisition [Line Items]
Oncology test reporting time				1 day
Net loss					$ 6,300,000
Working deficiency					11,400,000
Net cash used in operating activities					(5,177,000)	$ (5,983,000)
Issuance of common stock in connection with at the market offering, net of issuance costs					14,947,000
Proceeds from issuance of common stock					$ 16,207,000	6,921,000
Proceeds from PPP Loan						$ 787,000
Common stock, par value					$ 0.01		$ 0.01
Sale of common stock						2,060,000
Term of test reporting time for patients					1 day
Maximum
Business Acquisition [Line Items]
Oncology test reporting time				10 days
Term of test reporting time for patients					10 days
Minimum
Business Acquisition [Line Items]
Oncology test reporting time				7 days
Term of test reporting time for patients					7 days
Sales Agreement with Alliance Global Partners
Business Acquisition [Line Items]
Proceeds from issuance of common stock	$ 15,400,000
Maximum aggregate initial offering price									$ 50,000,000.0
Common stock, par value	$ 0.01
Sale of common stock	4,501,000
Additional shares available for future sales	$ 6,600,000
Sales Agreement with Alliance Global Partners | Maximum
Business Acquisition [Line Items]
Proceeds from issuance of common stock	$ 22,000,000.0
Lincoln Park [Member]
Business Acquisition [Line Items]
Issuance of common stock in connection with at the market offering, net of issuance costs			$ 10,000,000
Shares sold in offering (in shares)				0		1,040,654
Proceeds from issuance of common stock				$ 0		$ 1,400,000
Sale of common stock		4,500,000
Joint Venture [Member]
Business Acquisition [Line Items]
Percentage of interest in joint venture								49.00%
Joint Venture [Member] | Poplar Put Right [Member] | Scenario, Plan [Member]
Business Acquisition [Line Items]
Percentage of interest in joint venture								100.00%
Price per share								$ 1.00
Purchase price								$ 51
Joint Venture [Member] | Popular Healthcare PLLC [Member]
Business Acquisition [Line Items]
Percentage of interest in joint venture								51.00%

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