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Cash, Cash Equivalents and Short-Term Investments - Equity Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash, Cash Equivalents and Short-Term Investments      
Net losses recognized during the year on equity securities $ (1,386) $ (245) $ (102)
Less: net losses recognized during the year on equity securities sold during the year   1,090  
Unrealized gains (losses) recognized during the year on equity securities still held at December 31, 2021, 2020 and 2019 $ (1,386) $ 845 $ (102)