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Fair Value Measurements - Estimated Value of Cash, Cash Equivalents, Marketable Securities, and Equity Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2024
Cash equivalents:
Amortized cost	$ 224,947	$ 193,706
Cash and cash equivalents	224,947	193,705
Marketable securities:
Amortized cost	2,496	105,945
Unrealized gains	0	4
Unrealized losses	(1)	(1,130)
Corporate debt securities	2,495	104,819
Long-term investments:
Amortized cost	1,108
Unrealized gains	0
Unrealized losses	(477)
Estimated fair value	631	46
Cash Equivalents
Marketable securities:
Unrealized gains		0
Unrealized losses		(1)
Money market funds
Cash equivalents:
Amortized cost	224,947	186,744
Cash and cash equivalents	224,947	186,744
U.S. Treasury securities
Cash equivalents:
Amortized cost		3,484
Cash and cash equivalents		3,484
Marketable securities:
Amortized cost		28,341
Unrealized gains		0
Unrealized losses		(13)
Corporate debt securities		28,328
Commercial paper
Cash equivalents:
Amortized cost		3,478
Cash and cash equivalents		3,477
Marketable securities:
Amortized cost		27,374
Unrealized gains		0
Unrealized losses		(23)
Corporate debt securities		27,351
Commercial paper | Cash Equivalents
Marketable securities:
Unrealized gains		0
Unrealized losses		(1)
Corporate debt securities
Marketable securities:
Amortized cost		25,509
Unrealized gains		0
Unrealized losses		(19)
Corporate debt securities		25,490
Government-related debt securities
Marketable securities:
Amortized cost	2,496	23,613
Unrealized gains	0	4
Unrealized losses	(1)	(13)
Corporate debt securities	$ 2,495	23,604
Common stock in LianBio
Marketable securities:
Amortized cost		1,108
Unrealized gains		0
Unrealized losses		(1,062)
Corporate debt securities		$ 46

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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