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Cash, Cash Equivalents and Short-Term Investments - Equity Investments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Cash, Cash Equivalents and Short-Term Investments    
Net losses recognized during the six months ended June 30 on equity securities $ (156) $ (468)
Less: net gains (losses) recognized during the year on equity securities sold during the period   (805)
Unrealized gains (losses) recognized during the six months on equity securities still held at June 30, 2021 and 2020 $ (156) $ 337