CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating activities
Net loss	$ (10,644)	$ (17,191)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	511	473
Non-cash stock-based compensation	1,786	2,411
Amortization of financing lease right-of-use assets	526	397
Amortization of operating lease right-of-use assets	416	393
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	943	878
Other non-current assets	0	(65)
Accounts payable	(10)	518
Accrued expenses and other current liabilities	(412)	(1,422)
Short-term operating lease liabilities	225	69
Long-term operating lease liabilities	(390)	(471)
Net cash used in operating activities	(7,049)	(14,010)
Investing activities
Purchases of property and equipment	0	(71)
Construction in progress	0	(83)
Net cash used in investing activities	0	(154)
Financing activities
Payment of issuance costs from December 2023 issuance of common stock	0	(89)
Proceeds from the issuance of common stock, net of issuance costs	7,352	3,528
Principal payments on financing leases	(459)	(362)
Net cash provided by financing activities	9,160	3,102
Net increase (decrease) in cash and restricted cash	2,111	(11,062)
Cash and restricted cash at beginning of period	11,386	21,538
Cash and restricted cash at end of period	13,497	10,476
Cash, end of period	13,226	10,217
Restricted cash, end of period	271	259
Cash and restricted cash, end of period	13,497	10,476
Supplemental disclosure of non-cash financing and investing activities:
Initial measurement of operating lease right-of-use assets and liabilities	0	714
Initial measurement of finance lease right-of-use assets and liabilities	0	564
Lease modification of operating lease right-of-use assets and liabilities	(1,287)	492
Series A & B Warrants
Financing activities
Proceeds from the exercise of Series C warrants, net of issuance costs	1,884	25
Series C Warrants
Financing activities
Proceeds from the exercise of Series C warrants, net of issuance costs	$ 383	$ 0