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Financial Instruments and Fair Value Measurements - Equity Investment in InCarda (Details) - InCarda
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Oct. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
director
Dec. 31, 2020
USD ($)
Equity Investment      
Number of Investee's Board members currently representing the Company | director   1  
Number of the Investee's Board members | director   8  
Equity investment ownership percentage   13.00%  
Term of warrants 1 year    
Series C preferred stock and warrants      
Equity Investment      
Payments to acquire equity securities $ 15.0    
Transaction costs to acquire equity securities $ 0.8    
Equity and long-term investments at fair value   $ 15.8  
Unrealized loss from fair value changes in equity investments   (0.5)  
Impairment of equity investments   0.0  
Series C preferred stock      
Equity Investment      
Number of shares purchased under the securities purchase agreement | shares 20,469,432    
Warrants      
Equity Investment      
Number of warrants purchased under the securities purchase agreement | shares 5,117,358    
Exercise price of warrants | $ / shares $ 0.7328    
Equity and long-term investments at fair value   $ 0.7 $ 1.1