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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net loss	$ (70,522)	$ (92,182)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	135	65
Loss on disposal of fixed assets	100
Gain on lease termination	(88)
Amortization of right-of-use assets - operating	589	208
Stock-based compensation	12,314	14,435
Accretion of marketable securities, net	(4,793)	(4,569)
Changes in operating assets and liabilities
Prepaid expenses and other assets	(5,391)	(1,515)
Operating lease liabilities	(377)	(197)
Accounts payable	828	(2,371)
Accrued expenses	(4,958)	5,923
Net cash used in operating activities	(72,163)	(80,203)
Cash flows from investing activities
Purchases of marketable securities, available-for-sale	(176,160)	(172,821)
Proceeds from maturities of marketable securities, available-for-sale	142,640	189,000
Purchases of property and equipment	(235)	(255)
Net cash (used in) provided by investing activities	(33,755)	15,924
Cash flows from financing activities
Proceeds from issuance of common stock from private placement, net of offering costs	95,046
Proceeds from issuance of common stock from at-the-market offering,net of commissions and offering expenses		48,408
Proceeds from exercise of stock options	118	2,570
Proceeds from issuance of common stock under employee stock purchase plan	114	214
Deferred offering costs		(73)
Net cash provided by financing activities	95,278	51,119
Effect of exchange rates on cash, cash equivalents and restricted cash	(14)	58
Net decrease in cash, cash equivalents and restricted cash	(10,654)	(13,102)
Cash, cash equivalents and restricted cash, beginning of period	52,554	64,819
Cash, cash equivalents and restricted cash, end of period	$ 41,900	51,717
Supplemental disclosure for investing and financing non-cash activities:
Purchases of property and equipment included in accounts payable and accrued expenses		30
Exercise of stock options		54
Unpaid deferred offering costs		$ 66

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