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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents    
Cash $ 32,647 $ 27,788
Cash equivalents:    
Money market mutual fund 101,801 111,313
Total cash and cash equivalents 134,448 139,101
Short-term investments:    
Total short-term investments 465,063 489,698
Cash, cash equivalents and short-term investments 599,511 628,799
U.S. Treasury notes and bills    
Short-term investments:    
Short-term Investments 316,939 223,896
Mutual fund    
Short-term investments:    
Short-term Investments 105,536 110,006
Corporate debt securities    
Short-term investments:    
Short-term Investments $ 42,588 $ 155,796