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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in InCarda (Details) - InCarda - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 06, 2020
Dec. 31, 2020
Equity Investment    
Equity investment ownership percentage   13.40%
Series C preferred stock and warrants    
Equity Investment    
Amount of securities purchase agreement $ 15.0  
Unrealized gain from fair value changes in equity investments   $ 1.1
Impairment of equity investments   $ 0.0
Series C preferred stock    
Equity Investment    
Number of shares to be purchased under the securities purchase agreement 20,469,432  
Warrants    
Equity Investment    
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement 5,117,358  
Exercise price of warrants   $ 0.7328
Term of warrants   1 year
Equity and long-term investments at fair value   $ 1.1