Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (7,230)	$ (5,878)	$ (6,229)	$ (6,281)	$ (19,157)	$ (22,340)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation					1,518	4,102
Impairment charge on investment in equity securities	1,710		0		1,710	2,990	$ 2,990
Depreciation					13	9
Loss on disposal of assets					3	0
Changes in operating assets and liabilities:
Prepaid materials					202	3,148
Prepaid expenses and other current assets					1,212	542
Other assets					(40)	(1,697)
Accounts payable					755	(2,247)
Accrued expenses					721	202
Payroll liabilities					(593)	(81)
Other current liabilities					(323)	2
Net cash used in operating activities					(13,979)	(15,370)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment					(19)	(14)
Net cash used in investing activities					(19)	(14)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of warrants					304	0
Common stock repurchased						(1,475)
Net cash provided by (used in) financing activities					304	(1,475)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH					(13,694)	(16,859)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING BALANCE		$ 88,570		$ 111,000	88,570	111,000	111,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, ENDING BALANCE	74,876		94,141		74,876	94,141	88,570
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents	74,766		94,031		74,766	94,031	88,460
Restricted cash	110		110		110	110
Total cash, cash equivalents and restricted cash	$ 74,876		$ 94,141		74,876	94,141	$ 88,570
NON CASH INVESTING AND FINANCING ACTIVITIES
Common stock issued upon cashless exercise of stock options					$ 273	$ 0