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Cash, Cash Equivalents and Short-Term Investments - Equity Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash, Cash Equivalents and Short-Term Investments    
Net losses recognized during the three months on equity securities $ (4,908) $ (263)
Unrealized losses recognized during the three months on equity securities still held at March 31, 2022 and 2021 $ (4,908) $ (263)