Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 1,059,333		$ 1,059,333		$ 1,333,022
Gross Unrealized Gains	17,552		17,552		158
Gross Unrealized Losses	(413)		(413)		(12,641)
Fair Value	1,076,472		1,076,472		1,320,539
Cash and Cash Equivalents	566,452		566,452		598,545
Marketable Securities	107,550		107,550		77,940
Short-Term Investments	402,470		402,470		644,054
Marketable securities, unrealized gain	7,800	$ 10,000	29,600	$ 25,600
Debt securities, available-for-sale, unrealized Loss			345,500		420,400
Continuous unrealized loss position of available-for-sale investments, unrealized losses	14,900		14,900		138,800
Continuous unrealized loss position of available-for-sale investments, gross unrealized losses	100		100		300
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	761,212		761,212		700,337
Gross Unrealized Gains	17,552		17,552		150
Gross Unrealized Losses	(413)		(413)		(12,471)
Fair Value	778,351		778,351		688,016
Cash and Cash Equivalents	420,782		420,782		191,802
Marketable Securities	107,550		107,550		77,940
Short-Term Investments	250,019		250,019		418,274
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	219,870		219,870		225,942
Gross Unrealized Gains					8
Gross Unrealized Losses					(170)
Fair Value	219,870		219,870		225,780
Cash and Cash Equivalents	67,419		67,419
Short-Term Investments	152,451		152,451		225,780
Agency bonds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost					222,057
Gross Unrealized Gains					2
Gross Unrealized Losses					(174)
Fair Value					221,885
Cash and Cash Equivalents					101,635
Short-Term Investments					120,250
Treasury bills | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	116,330		116,330		148,063
Gross Unrealized Gains	2		2		28
Gross Unrealized Losses	(27)		(27)
Fair Value	116,305		116,305		148,091
Cash and Cash Equivalents	66,511		66,511		88,697
Short-Term Investments	49,794		49,794		59,394
U.S. Government | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	200,567		200,567		238,747
Gross Unrealized Gains					120
Gross Unrealized Losses	(342)		(342)		(237)
Fair Value	200,225		200,225		238,630
Short-Term Investments	200,225		200,225		238,630
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 Gains	17,550		17,550
Gross Unrealized Losses					(12,060)
Fair Value	107,550		107,550		77,940
Marketable Securities	107,550		107,550		77,940
Term deposits | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	218,870		218,870		128,205
Fair Value	218,870		218,870		128,205
Cash and Cash Equivalents	67,419		67,419
Short-Term Investments	151,451		151,451		128,205
Corporate bonds | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	1,000		1,000		80,646
Gross Unrealized Gains					8
Gross Unrealized Losses					(165)
Fair Value	1,000		1,000		80,489
Short-Term Investments	1,000		1,000		80,489
Treasury inflation-protected securities | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost					2,635
Gross Unrealized Losses					(5)
Fair Value					2,630
Short-Term Investments					2,630
Commercial paper | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost					14,456
Fair Value					14,456
Short-Term Investments					14,456
Cash | Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	78,251		78,251		406,743
Fair Value	78,251		78,251		406,743
Cash and Cash Equivalents	78,251		78,251		406,743
Money market funds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	254,304		254,304		1,470
Fair Value	254,304		254,304		1,470
Cash and Cash Equivalents	254,304		254,304		$ 1,470
Agency bonds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	100,011		100,011
Gross Unrealized Losses	(44)		(44)
Fair Value	99,967		99,967
Cash and Cash Equivalents	$ 99,967		$ 99,967