Cash, Cash Equivalents and Short-Term investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Cash, Cash Equivalents and Short-Term Investments
Cash	$ 40,760	$ 34,752
Cash equivalents:
Money market mutual fund	18,713	1,843
Total cash and cash equivalents	59,473	36,595
Short-term investments:
Total short-term investments	406,389	486,728
Cash, cash equivalents and short-term investments	465,862	523,323
U.S. Treasury notes and bills
Short-term investments:
Short-term Investments	129,931	190,718
Mutual funds
Short-term investments:
Short-term Investments	97,522	99,777
Corporate debt securities
Short-term investments:
Short-term Investments	$ 178,936	$ 196,233

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