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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents
Cash	$ 28,761	$ 27,788
Cash equivalents:
Money market mutual fund	8,273	111,313
Total cash and cash equivalents	37,034	139,101
Short-term investments:
Total short-term investments	513,584	489,698
Cash, cash equivalents and short-term investments	550,618	628,799
U.S. Treasury notes and bills
Short-term investments:
Short-term Investments	205,816	223,896
Mutual funds
Short-term investments:
Short-term Investments	102,514	110,006
Corporate debt securities
Short-term investments:
Short-term Investments	$ 205,254	$ 155,796

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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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