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Financial Instruments and Fair Value Measurements - Equity Investment in ImaginAb (Details) - ImaginAb
$ in Millions
Mar. 18, 2021
USD ($)
shares
Jun. 30, 2021
USD ($)
Apr. 28, 2021
director
Equity Investment      
Transaction costs to acquire equity securities $ 0.4    
Equity investment ownership percentage   12.50%  
Number of Investee's Board members currently representing the Company | director     1
Number of the Investee's Board members | director     5
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