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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents
Cash	$ 29,296	$ 25,053
Cash equivalents:
Money market mutual fund	14,384	11,820
Total cash and cash equivalents	43,680	36,873
Short-term investments:
Total short-term investments	305,802	56,444
Cash, cash equivalents and short-term investments	349,482	93,317
U.S. Treasury notes and bills
Short-term investments:
Short-term Investments	153,377	23,309
Mutual Funds [Member]
Short-term investments:
Short-term Investments	110,060	$ 33,135
Corporate debt securities
Short-term investments:
Short-term Investments	$ 42,365

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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