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FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - USD ($)
3 Months Ended 9 Months Ended
Aug. 03, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2007
Equity Investments [Line Item]            
Number of shares owned 35,990,825          
Description of acquisition of Sienna Cancer Diagnostics by BARD1 Life Sciences we received 13 BARD1 shares for every five shares of Sienna ordinary shares, resulting in our ownership of 35,990,825 shares of BARD1.          
Proceeds from sales of equity investment       $ 339,000    
Equity Investment            
Equity Investments [Line Item]            
Number of shares owned   20,667,886   20,667,886   13,842,625
Cost method investments cost basis           $ 0
Realized investment gain (loss) $ 182,000 $ (34,000)        
Number of shares sold   15,322,939        
Proceeds from sales of equity investment   $ 339,000        
Fair value of equity investment   385,000   $ 385,000    
Increase (decrease) in fair value of equity investment   (118,000) $ (195,000) 109,000 $ (195,000)  
Gains (losses) related to foreign currency translation   $ 27,000 $ (14,000) $ 78,000 $ (17,000)  
Equity Investment | Maximum            
Equity Investments [Line Item]            
Cost method investments Ownership           20.00%