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Cash, Cash Equivalents and Short-Term Investments - Equity investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash, Cash Equivalents and Short-Term Investments    
Investments in equity securities $ 101,300  
Net losses recognized during the three months on equity securities   $ (4,908)
Less: net gains (losses) recognized during the year on equity securities sold during the period 1,510  
Unrealized losses recognized during the three months on equity securities still held at March 31, 2023 and 2022 $ 1,510 $ (4,908)