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Financial Instruments and Fair Value Measurements - Equity Investment in InCarda (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 15, 2022
USD ($)
$ / shares
shares
Mar. 09, 2022
USD ($)
Jun. 30, 2022
USD ($)
Director
$ / shares
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
Director
$ / shares
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Equity Investment                
Equity and long-term investments     $ 494,097,000     $ 494,097,000   $ 483,845,000
InCarda                
Equity Investment                
Number of Investee's Board members currently representing the Company | Director     1     1    
Number of the Investee's Board members | Director     8     8    
Equity investment ownership percentage     8.90%     8.90%   13.00%
Unrealized loss from fair value changes in equity investments       $ 300,000     $ 700,000  
Unrealized loss from fair value changes in equity investments     $ 9,600,000     $ 9,000,000.0    
InCarda | Series C preferred stock and warrants                
Equity Investment                
Amount of securities purchase agreement         $ 15,800,000      
InCarda | Warrants                
Equity Investment                
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares         5,117,358      
Equity and long-term investments at fair value               $ 400,000
Exercise price of warrants | $ / shares     $ 0.7328     $ 0.7328    
Extended expiration date           Mar. 31, 2023    
InCarda | Convertible note and warrants                
Equity Investment                
Amount of securities purchase agreement   $ 700,000            
InCarda | Common stock                
Equity Investment                
Number of shares to be purchased under the securities purchase agreement | shares 4,093,886              
InCarda | Series A1 preferred stock                
Equity Investment                
Debt Conversion, Converted Instrument, Shares Issued | shares 37,350              
InCarda | Series D 1 Preferred Stock                
Equity Investment                
Number of shares to be purchased under the securities purchase agreement | shares 8,771,780              
InCarda | Series D 2 Preferred Stock                
Equity Investment                
Debt Conversion, Converted Instrument, Shares Issued | shares 3,369,802              
Exercise price of warrants | $ / shares $ 0.26              
InCarda | Series D2 Warrants                
Equity Investment                
Debt Conversion, Converted Instrument, Shares Issued | shares 2,490,033              
InCarda | Series C preferred stock                
Equity Investment                
Number of shares to be purchased under the securities purchase agreement | shares         20,469,432      
Number of warrants purchased under the securities purchase agreement | shares         5,117,358      
Transaction cost         $ 800,000      
Equity and long-term investments at fair value               15,800,000
Impairment of equity investments           $ 9,000,000.0   $ 0
Exercise price of warrants | $ / shares         $ 0.73      
InCarda | Series C Preferred Stock and Series C and D Warrants                
Equity Investment                
Equity and long-term investments at fair value     $ 7,200,000     7,200,000    
InCarda | Series D Preferred Stock                
Equity Investment                
Payments to acquire equity securities $ 2,300,000              
InCarda | Series D1 Preferred Stock, Series D2 Preferred Stock and Common Stock                
Equity Investment                
Equity and long-term investments at fair value     $ 3,200,000     $ 3,200,000    
InCarda | Significant Unobservable Inputs, Level 3 | Backsolve Valuation                
Equity Investment                
Risk free interest rate           3.20%    
Dividend yield           0.00%    
Estimated volatility           122.00%    
InCarda Convertible Note                
Equity Investment                
Debt Instrument, annual interest rate   6.00%            
Gross Proceeds from sale of equity   $ 10,000,000.0            
Debt instrument principal amount percentage           100.00%