Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale securities:
Short-term investments, Amortized Cost	$ 165,826	$ 320,583
Short-term investments, Gross Unrealized Gains	1	16
Short-term investments, Gross Unrealized Losses, Less than One Year	(198)	(718)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(2,375)	(3,889)
Short-term investments, Estimated Fair Value	163,254	315,992
Long-term investments, Amortized Cost	79,044	134,548
Long-term investments, Gross Unrealized Losses, Less than One Year	(992)	(2,467)
Long-term investments, Gross Unrealized Losses, Greater than One Year	(1,745)	(2,291)
Long-term investments, Estimated Fair Value	76,307	129,790
Held-to-maturity securities:
Estimated Fair Value	1,820
Long-term Investments
Amortized Cost	80,864	136,368
Gross Unrealized Losses, Less than One Year	(992)	(2,467)
Gross Unrealized Losses, Greater than One Year	(1,745)	(2,291)
Total long-term investments	78,127	131,610
Total investments
Amortized Cost	246,690	456,951
Gross Unrealized Gains	1	16
Gross Unrealized Losses, Less than One Year	(1,190)	(3,185)
Gross Unrealized Losses, Greater than One Year	(4,120)	(6,180)
Estimated Fair Value	241,381	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	77,279	141,418
Short-term investments, Gross Unrealized Losses, Less than One Year	(82)	(424)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(1,106)	(2,054)
Short-term investments, Estimated Fair Value	76,091	138,940
Long-term investments, Amortized Cost	38,825	68,229
Long-term investments, Gross Unrealized Losses, Less than One Year	(529)	(1,550)
Long-term investments, Gross Unrealized Losses, Greater than One Year	(765)	(676)
Long-term investments, Estimated Fair Value	37,531	66,003
U.S. government and agency debt securities
Available-for-sale securities:
Short-term investments, Amortized Cost	73,188	143,710
Short-term investments, Gross Unrealized Gains	1	16
Short-term investments, Gross Unrealized Losses, Less than One Year	(116)	(266)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(991)	(1,289)
Short-term investments, Estimated Fair Value	72,082	142,171
Long-term investments, Amortized Cost	40,219	62,220
Long-term investments, Gross Unrealized Losses, Less than One Year	(463)	(917)
Long-term investments, Gross Unrealized Losses, Greater than One Year	(980)	(1,424)
Long-term investments, Estimated Fair Value	38,776	59,879
Non-U.S. government debt securities
Available-for-sale securities:
Short-term investments, Amortized Cost	15,359	35,455
Short-term investments, Gross Unrealized Losses, Less than One Year		(28)
Short-term investments, Gross Unrealized Losses, Greater than One Year	(278)	(546)
Short-term investments, Estimated Fair Value	$ 15,081	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