Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (8,423)	$ (6,049)	$ (15,141)	$ (11,927)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation			1,359	769
Depreciation			8	9
Loss on disposal of assets			0	4
Changes in operating assets and liabilities:
Prepaid materials			(1,377)	392
Prepaid expenses and other current assets			90	1,175
Other assets			(10)	(111)
Accounts payable			1,331	250
Accrued expenses			1,281	934
Payroll liabilities			(808)	(715)
Other current liabilities			49	(9)
Net cash used in operating activities			(13,218)	(9,229)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment			(9)	(9)
Net cash used in investing activities			(9)	(9)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of warrants		100	0	304
Net cash provided by financing activities			0	304
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH			(13,227)	(8,934)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING BALANCE			71,194	88,570
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, ENDING BALANCE	57,967	79,636	57,967	79,636
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents	57,857	79,526	57,857	79,526
Restricted cash	110	110	110	110
Total cash, cash equivalents and restricted cash	$ 57,967	$ 79,636	57,967	79,636
Noncash Investing and Financing Items [Abstract]
Common Stock issued upon cashless exercise of stock options			$ 0	$ 228