Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities
Net loss	$ (21,168)	$ (27,169)
Reconciliation of net loss to net cash used in operating activities:
Stock-based compensation	1,949	2,208
Non-cash interest expense	268	337
Amortization of premium and interest on marketable securities	(625)	(175)
Depreciation expense	14	20
Loss on extinguishment of debt	942	0
Changes in operating assets and liabilities:
Prepaid expenses and other assets	2,222	1,413
Accounts payable	(163)	(1,122)
Accrued expenses	(1,219)	(6,154)
Net cash used in operating activities	(17,780)	(30,642)
Investing activities
Purchase of marketable securities	(46,960)	0
Proceeds from sales and maturities of marketable securities	30,000	43,100
Net cash (used in) provided by investing activities	(16,960)	43,100
Financing activities
Proceeds from issuance of common stock, purchase warrants and pre-funded warrants for the purchase of common stock, net of underwriting discounts, commissions, and offering costs	0	46,503
Proceeds from issuance of common stock upon at-the-market offering, net of issuance costs	44,207	0
Proceeds from issuance of common stock upon stock option exercises	487	1,466
Proceeds from issuance of common stock upon exercise of common warrants	450	0
Common stock repurchase	(42)	(19)
Payment of debt extinguishment costs	(170)	0
Net cash provided by financing activities	44,932	47,950
Increase in cash and cash equivalents	10,192	60,408
Cash and cash equivalents, beginning of period	49,255	45,917
Cash and cash equivalents, end of period	59,447	106,325
Supplemental disclosure of cash flow information
Cash paid for interest	1,784	1,392
Supplemental disclosure of non-cash financing activities
Offering costs in accounts payable and accrued expenses	$ 0	$ 390