Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 1,213,302	$ 1,213,302	$ 1,183,222
Gross Unrealized Gains	45	45	57
Gross Unrealized Losses	(22,767)	(22,767)	(52,379)
Fair Value	1,190,580	1,190,580	1,130,900
Cash and Cash Equivalents	406,042	406,042	353,684
Marketable Securities	68,850	68,850	39,240
Short-Term Investments	715,688	715,688	581,769
Long-Term Investments			156,207
Debt securities, available-for-sale, unrealized Loss		390,400
Continuous unrealized loss position of available-for-sale investments, unrealized losses	27,000	27,000
Continuous unrealized loss position of available-for-sale investments, gross unrealized losses	300	300
Share Purchase Agreement with CLBT
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable Securities				$ 90,000
Investment owned, shares held				9.0
Investment, type				Common stock
Marketable securities, unrealized gain (loss)	4,100	29,600
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	419,909	419,909	378,805
Gross Unrealized Gains	37	37	24
Gross Unrealized Losses	(21,497)	(21,497)	(51,026)
Fair Value	398,449	398,449	327,803
Cash and Cash Equivalents	181,605	181,605	115,769
Marketable Securities	68,850	68,850	39,240
Short-Term Investments	147,994	147,994	78,427
Long-Term Investments			94,367
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	568,956	568,956	660,673
Gross Unrealized Gains	8	8	33
Gross Unrealized Losses	(1,270)	(1,270)	(1,353)
Fair Value	567,694	567,694	659,353
Cash and Cash Equivalents			94,171
Short-Term Investments	567,694	567,694	503,342
Long-Term Investments			61,840
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	224,437	224,437	143,744
Fair Value	224,437	224,437	143,744
Cash and Cash Equivalents	224,437	224,437	143,744
Money market funds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	25,292	25,292	2,669
Fair Value	25,292	25,292	2,669
Cash and Cash Equivalents	25,292	25,292	2,669
Agency bonds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	170,838	170,838	164,486
Gross Unrealized Gains	17	17	6
Gross Unrealized Losses	(347)	(347)	(263)
Fair Value	170,508	170,508	164,229
Cash and Cash Equivalents	33,500	33,500
Short-Term Investments	137,008	137,008	69,862
Long-Term Investments			94,367
Treasury bills | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	133,779	133,779
Gross Unrealized Gains	20	20
Fair Value	133,799	133,799
Cash and Cash Equivalents	122,813	122,813
Short-Term Investments	10,986	10,986
Marketable securities | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	90,000	90,000	90,000
Gross Unrealized Losses	(21,150)	(21,150)	(50,760)
Fair Value	68,850	68,850	39,240
Marketable Securities	68,850	68,850	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
Corporate bonds | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			257,422
Gross Unrealized Gains			33
Gross Unrealized Losses			(1,159)
Fair Value			256,296
Cash and Cash Equivalents			28,883
Short-Term Investments			168,074
Long-Term Investments			59,339
Treasury bills | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			121,650
Gross Unrealized Gains			18
Gross Unrealized Losses			(3)
Fair Value			121,665
Cash and Cash Equivalents			113,100
Short-Term Investments			8,565
Certificates of deposit | 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	203,205	203,205	200,000
Fair Value	203,205	203,205	200,000
Cash and Cash Equivalents			25,000
Short-Term Investments	203,205	203,205	175,000
Corporate bonds | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	121,071	121,071
Gross Unrealized Gains	8	8
Gross Unrealized Losses	(559)	(559)
Fair Value	120,520	120,520
Short-Term Investments	120,520	120,520
Commercial paper | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	65,703	65,703	160,241
Fair Value	65,703	65,703	160,241
Cash and Cash Equivalents			40,288
Short-Term Investments	65,703	65,703	119,953
U.S. government | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	176,371	176,371	30,525
Gross Unrealized Losses	(700)	(700)	(159)
Fair Value	175,671	175,671	30,366
Short-Term Investments	175,671	175,671	30,366
Treasury Inflation-Protected Securities | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	2,606	2,606	2,503
Gross Unrealized Losses	(11)	(11)	(2)
Fair Value	2,595	2,595	2,501
Short-Term Investments	$ 2,595	$ 2,595
Long-Term Investments			$ 2,501