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Cash, Cash Equivalents and Short-Term Investments - Equity investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash, Cash Equivalents and Short-Term Investments      
Investments in equity securities $ 101,800 $ 99,800  
Net losses recognized during the twelve months on equity securities (3,764) (11,406) $ (1,386)
Less: net gains recognized during the year on equity securities sold during the year 5,072    
Unrealized gains (losses) recognized during the year on equity securities still held at December 31, 2023, 2022 and 2021 $ 1,308 $ (11,406) $ (1,386)