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BUSINESS DESCRIPTION (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 14 Months Ended
Apr. 02, 2021
Jun. 26, 2020
Mar. 26, 2020
Sep. 07, 2018
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 14, 2021
Apr. 30, 2020
Apr. 13, 2020
Business Acquisition [Line Items]                          
Oncology test reporting time           1 day              
Net loss         $ 4,400,000     $ 4,400,000          
Working deficiency         13,300,000     13,300,000          
Net cash used in operating activities               (3,048,000) $ (3,562,000)        
Issuance of common stock in connection with at the market offering, net of issuance costs         $ 14,947,000     14,947,000          
Proceeds from issuance of common stock               $ 16,207,000 2,607,000        
Proceeds from PPP Loan                 $ 787,000 $ 800,000      
Common stock, par value         $ 0.01     $ 0.01   $ 0.01      
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     $ 10,000,000.0 $ 10,000,000                  
Shares sold in offering (in shares)             110,642   1,040,654   4,980,000    
Proceeds from issuance of common stock             $ 100,000   $ 1,400,000        
Sale of common stock   4,500,000                      
LP 2020 Purchase Agreement [Member]                          
Business Acquisition [Line Items]                          
Proceeds from issuance of common stock                     $ 8,800,000    
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%