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FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 01, 2020
Aug. 03, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2007
Equity Investments [Line Item]              
Number of shares owned   35,990,825   688,929     13,842,625
Business Combination Cost Of Acquired Entity Equity Interests Issued And Issuable Fair Value Method   we received 13 BARD1 shares for every five shares of Sienna ordinary shares, resulting in our ownership of 35,990,825 shares of BARD1.          
Realized investment gains (losses)   $ 182,000 $ (34,000)        
Number Of Shares Sold From Equity Investment     15,322,939        
Proceeds from sales of equity investment     $ 339,000 $ 339,000      
Equity investment reverse stock split 1 for 30            
Maximum              
Equity Investments [Line Item]              
Cost Method Investment Ownership Percentage             20.00%
Equity Investment              
Equity Investments [Line Item]              
Cost method investments cost basis             $ 0
Fair value of equity investment       361,000      
Increase (decrease) in fair value of equity investment       60,000 $ (195,000) $ (541,000)  
Gain (loss) related to foreign currency translation       $ 103,000 $ (1,000) $ (63,000)