Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 1,333,022	$ 1,183,222
Gross Unrealized Gains	158	57
Gross Unrealized Losses	(12,641)	(52,379)
Fair Value	1,320,539	1,130,900
Cash and Cash Equivalents	598,545	353,684
Marketable Securities	77,940	39,240
Short-Term Investments	644,054	581,769
Long-Term Investments		156,207
Marketable securities, unrealized gain	38,700
Debt securities, available-for-sale, unrealized Loss	420,400	349,600
Continuous unrealized loss position of available-for-sale investments, unrealized losses	138,800	29,700
Continuous unrealized loss position of available-for-sale investments, gross unrealized losses	300	900
Share Purchase Agreement with CLBT
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable Securities			$ 90,000
Investment owned, shares held			9,000,000
Investment, type			Common Stock
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	700,337	378,805
Gross Unrealized Gains	150	24
Gross Unrealized Losses	(12,471)	(51,026)
Fair Value	688,016	327,803
Cash and Cash Equivalents	191,802	115,769
Marketable Securities	77,940	39,240
Short-Term Investments	418,274	78,427
Long-Term Investments		94,367
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	225,942	660,673
Gross Unrealized Gains	8	33
Gross Unrealized Losses	(170)	(1,353)
Fair Value	225,780	659,353
Cash and Cash Equivalents		94,171
Short-Term Investments	225,780	503,342
Long-Term Investments		61,840
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	406,743	143,744
Fair Value	406,743	143,744
Cash and Cash Equivalents	406,743	143,744
Money market funds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	1,470	2,669
Fair Value	1,470	2,669
Cash and Cash Equivalents	1,470	2,669
Agency bonds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	222,057	164,486
Gross Unrealized Gains	2	6
Gross Unrealized Losses	(174)	(263)
Fair Value	221,885	164,229
Cash and Cash Equivalents	101,635
Short-Term Investments	120,250	69,862
Long-Term Investments		94,367
Treasury bills | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	148,063	121,650
Gross Unrealized Gains	28	18
Gross Unrealized Losses		(3)
Fair Value	148,091	121,665
Cash and Cash Equivalents	88,697	113,100
Short-Term Investments	59,394	8,565
Marketable securities | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	90,000	90,000
Gross Unrealized Losses	(12,060)	(50,760)
Fair Value	77,940	39,240
Marketable Securities	77,940	39,240
State and municipal obligations | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		4,980
Gross Unrealized Losses		(33)
Fair Value		4,947
Short-Term Investments		4,947
Certificates of deposits | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		5,002
Fair Value		5,002
Short-Term Investments		5,002
Term deposits | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	128,205	200,000
Fair Value	128,205	200,000
Cash and Cash Equivalents		25,000
Short-Term Investments	128,205	175,000
Corporate bonds | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	80,646	257,422
Gross Unrealized Gains	8	33
Gross Unrealized Losses	(165)	(1,159)
Fair Value	80,489	256,296
Cash and Cash Equivalents		28,883
Short-Term Investments	80,489	168,074
Long-Term Investments		59,339
Commercial paper | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	14,456	160,241
Fair Value	14,456	160,241
Cash and Cash Equivalents		40,288
Short-Term Investments	14,456	119,953
U.S. Government | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	238,747
Gross Unrealized Gains	120
Gross Unrealized Losses	(237)
Fair Value	238,630
Short-Term Investments	238,630
U.S. Government | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		30,525
Gross Unrealized Losses		(159)
Fair Value		30,366
Short-Term Investments		30,366
Treasury Inflation-Protected Securities | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	2,635	2,503
Gross Unrealized Losses	(5)	(2)
Fair Value	2,630	2,501
Short-Term Investments	$ 2,630
Long-Term Investments		$ 2,501