Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale securities:
Short-term investments, Amortized Cost	$ 315,767	$ 320,583
Short-term investments, Gross Unrealized Gains	1,461	16
Short-term investments, Gross Unrealized Losses, Less than One Year	(51)	(718)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(1,155)	(3,889)
Short-term investments, Estimated Fair Value	316,022	315,992
Long-term investments, Amortized Cost	38,698	134,548
Long-term investments, Gross Unrealized Losses, Less than One Year	(27)	(2,467)
Long-term investments, Gross Unrealized Losses, Greater than One Year	(604)	(2,291)
Long-term investments, Estimated Fair Value	38,067	129,790
Held-to-maturity securities:
Estimated Fair Value	1,820
Long-term Investments
Amortized Cost	40,518	136,368
Gross Unrealized Losses, Less than One Year	(27)	(2,467)
Gross Unrealized Losses, Greater than One Year	(604)	(2,291)
Total long-term investments	39,887	131,610
Total investments
Amortized Cost	356,285	456,951
Gross Unrealized Gains	1,461	16
Gross Unrealized Losses, Less than One Year	(78)	(3,185)
Gross Unrealized Losses, Greater than One Year	(1,759)	(6,180)
Estimated Fair Value	355,909	447,602
Certificates of deposit
Held-to-maturity securities:
Amortized Cost	1,820	1,820
Estimated Fair Value	1,820	1,820
Corporate debt securities
Available-for-sale securities:
Short-term investments, Amortized Cost	112,055	141,418
Short-term investments, Gross Unrealized Gains	703
Short-term investments, Gross Unrealized Losses, Less than One Year	(15)	(424)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(536)	(2,054)
Short-term investments, Estimated Fair Value	112,207	138,940
Long-term investments, Amortized Cost	19,306	68,229
Long-term investments, Gross Unrealized Losses, Less than One Year		(1,550)
Long-term investments, Gross Unrealized Losses, Greater than One Year	(289)	(676)
Long-term investments, Estimated Fair Value	19,017	66,003
U.S. government and agency debt securities
Available-for-sale securities:
Short-term investments, Amortized Cost	199,708	143,710
Short-term investments, Gross Unrealized Gains	758	16
Short-term investments, Gross Unrealized Losses, Less than One Year	(36)	(266)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(611)	(1,289)
Short-term investments, Estimated Fair Value	199,819	142,171
Long-term investments, Amortized Cost	19,392	62,220
Long-term investments, Gross Unrealized Losses, Less than One Year	(27)	(917)
Long-term investments, Gross Unrealized Losses, Greater than One Year	(315)	(1,424)
Long-term investments, Estimated Fair Value	19,050	59,879
Non-U.S. government debt securities
Available-for-sale securities:
Short-term investments, Amortized Cost	4,004	35,455
Short-term investments, Gross Unrealized Losses, Less than One Year		(28)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(8)	(546)
Short-term investments, Estimated Fair Value	$ 3,996	34,881
Long-term investments, Amortized Cost		4,099
Long-term investments, Gross Unrealized Losses, Greater than One Year		(191)
Long-term investments, Estimated Fair Value		$ 3,908