CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities
Net loss	$ (16,108)	$ (20,806)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	467	3,247
Depreciation and amortization	13	27
Non-cash lease expense	131	121
Loss on disposal of property and equipment	0	2
Change in fair value of warrant liability	(619)	0
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	887	727
Other assets	0	73
Accounts payable	(488)	(2,650)
Accrued expenses and other current liabilities	(5,400)	(3,079)
Deferred revenue	0	(3,613)
Other liabilities	(438)	(113)
Net cash used in operating activities	(21,555)	(26,064)
Cash flows from financing activities
Proceeds from exercise of common stock options	0	180
Proceeds from issuance of common stock related to employee stock purchase plan	0	52
Repayment of term loan	(811)	(811)
Tax withholding payments on restricted stock units	0	(13)
Net cash used in financing activities	(811)	(592)
Net decrease in cash, cash equivalents, and restricted cash	(22,366)	(26,656)
Cash, cash equivalents, and restricted cash at beginning of period	38,788	96,374
Cash, cash equivalents, and restricted cash at end of period	16,422	69,718
Reconciliation of cash, cash equivalents, and restricted cash
Cash and cash equivalents	16,387	69,683
Restricted cash, long-term (included in other assets)	35	35
Total cash, cash equivalents and restricted cash	$ 16,422	$ 69,718