Marketable Securities - Amortized Cost vs. Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	$ 794,161		$ 105,459
Fair Value	794,102		$ 105,694
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	688,788	$ 1,479
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	688,788	1,479
Cash equivalents | Money market funds
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	688,044	757
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	688,044	757
Cash equivalents | U.S treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities		472
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		472
Cash equivalents | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	249	250
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	249	250
Cash equivalents | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	495
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	495
Marketable securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	105,373	103,980
Gross Unrealized Gains	70	321
Gross Unrealized Losses	(129)	(86)
Fair Value	105,314	104,215
Marketable securities | U.S treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	59,193	59,856
Gross Unrealized Gains	35	211
Gross Unrealized Losses	(99)	(64)
Fair Value	59,129	60,003
Marketable securities | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	4,048	8,513
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(5)
Fair Value	4,047	8,508
Marketable securities | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	29,272	23,552
Gross Unrealized Gains	29	96
Gross Unrealized Losses	(16)	(9)
Fair Value	29,285	23,639
Marketable securities | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale securities	12,860	12,059
Gross Unrealized Gains	6	14
Gross Unrealized Losses	(13)	(8)
Fair Value	$ 12,853	$ 12,065