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Financial Instruments and Fair Value Measurements - Equity Investment in ImaginAb (Details) - ImaginAb
$ in Millions
Mar. 18, 2021
USD ($)
shares
Apr. 28, 2021
director
Mar. 31, 2021
USD ($)
Equity Investment      
Transaction costs to acquire equity securities $ 0.4    
Equity investment ownership percentage     13.00%
Number of Investee's Board members currently representing the Company | director   1  
Number of the Investee's Board members | director   7  
Equity and long-term investments at fair value     $ 6.4
Series C preferred stock      
Equity Investment      
Number of shares to be purchased under the securities purchase agreement | shares 4,051,724    
Amount of securities purchase agreement $ 4.7    
One of ImaginAb's Common Stockholders | Common stock      
Equity Investment      
Number of shares to be purchased under the securities purchase agreement | shares 4,097,157    
Amount of securities purchase agreement $ 1.3