Cash, Cash Equivalents and Investments - Cash, Cash Equivalents, Marketable Securities, and Available-for-Sale Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	$ 160,684	$ 168,294
Amortized Cost		1,721,546
Gross Unrealized Gains	1,660	12,234
Gross Unrealized Losses	(46)	(3)
Fair Value		1,733,777
Total, amortized cost	1,653,541
Total, fair value	1,655,155
Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	160,684	168,294
Fair Value		1,201,147
Total, fair value	1,458,817
Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	0	0
Fair Value		27,213
Total, fair value	14,751
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	0	0
Fair Value		505,417
Total, fair value	181,587
Level 1:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	1,170,029	1,075,026
Gross Unrealized Gains	1,651	12,192
Gross Unrealized Losses	(7)	0
Fair Value	1,171,673	1,087,218
Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	1,107,501	1,021,911
Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	14,751	27,213
Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	49,421	38,094
Level 2:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	322,828	478,226
Gross Unrealized Gains	9	42
Gross Unrealized Losses	(39)	(3)
Fair Value	322,798	478,265
Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	190,632	10,942
Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	132,166	467,323
Money market funds | Level 1:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	1,057,391	821,711
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1,057,391	821,711
Money market funds | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	1,057,391	821,711
Money market funds | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Money market funds | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
U.S. Treasury bills | Level 1:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	99,138	231,766
Gross Unrealized Gains	0	69
Gross Unrealized Losses	(7)	0
Fair Value	99,131	231,835
U.S. Treasury bills | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	50,110	200,200
U.S. Treasury bills | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
U.S. Treasury bills | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	49,021	31,635
Marketable securities | Level 1:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	13,100	15,093
Gross Unrealized Gains	1,651	12,120
Gross Unrealized Losses	0	0
Fair Value	14,751	27,213
Marketable securities | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Marketable securities | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	14,751	27,213
Marketable securities | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Agency bonds | Level 1:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	400	6,456
Gross Unrealized Gains	0	3
Gross Unrealized Losses	0	0
Fair Value	400	6,459
Agency bonds | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Agency bonds | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Agency bonds | Level 1: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	400	6,459
Term deposits | Level 2:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	219,257	385,942
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	219,257	385,942
Term deposits | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	143,558	10,942
Term deposits | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Term deposits | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	75,699	375,000
Corporate bonds | Level 2:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	88,981	72,322
Gross Unrealized Gains	9	42
Gross Unrealized Losses	(38)	(3)
Fair Value	88,952	72,361
Corporate bonds | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	43,355	0
Corporate bonds | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Corporate bonds | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	45,597	72,361
Commercial paper | Level 2:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	10,871	18,462
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Fair Value	10,870	18,462
Commercial paper | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Commercial paper | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Commercial paper | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	10,870	18,462
Certificates of deposit | Level 2:
Restricted Cash and Cash Equivalent Item [Line Items]
Amortized Cost	3,719	1,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	3,719	1,500
Certificates of deposit | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	3,719	0
Certificates of deposit | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecurities
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	0	0
Certificates of deposit | Level 2: | Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments
Restricted Cash and Cash Equivalent Item [Line Items]
Fair Value	$ 0	$ 1,500