Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (26,949)	$ (22,781)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	26	25
Stock-based compensation	4,058	1,024
Noncash lease expense	142	84
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(4,112)	(908)
Accounts payable	(7,360)	(10,750)
Accrued expenses	671	(2,084)
Operating lease liabilities	(75)	(76)
Net cash used in operating activities	(33,599)	(35,466)
Cash flow from investing activities:
Purchases of property and equipment	(67)	(29)
Net cash used in investing activities	(67)	(29)
Cash flow from financing activities:
Proceeds from sale of common stock in offerings, net of issuance costs paid	0	34,217
Proceeds from sale of pre-funded warrants in offerings, net of issuance costs paid	0	28,262
Proceeds from sale of common stock in at-the-market offerings, net of issuance costs paid	14,849	14,605
Proceeds from stock option exercises	806	222
Contributions from employee stock purchase plan	245	0
Net cash provided by financing activities	15,900	77,306
Net increase (decrease) in cash, cash equivalents and restricted cash	(17,766)	41,811
Cash, cash equivalents and restricted cash, beginning of period	360,616	194,788
Cash, cash equivalents and restricted cash, end of period	342,850	236,599
Supplemental cash flow information
Cash paid for income taxes	0	0
Supplemental disclosure of non-cash activities
Purchases of property and equipment included in accounts payable and accrued expenses	0	8
Receivable for proceeds from stock option exercises included in other current assets	0	845
Deferred issuance costs on sale of common stock and pre-funded warrants in offerings included in accounts payable and accrued expenses	$ 0	$ 222