CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net loss	$ (9,418)	$ (9,848)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	229	263
Stock-based compensation expense	945	1,032
Change in fair value of warrant liabilities	(1,618)	0
Other	11	34
Changes in assets and liabilities:
Accounts receivable, net	626	(2,154)
Unbilled receivables	412	47
Inventory	1,193	(833)
Prepaid expenses and other current assets	(1,241)	(1,252)
Prepaid inventory	0	693
Other long term assets	128	200
Accounts payable	600	1,208
Deferred grant funding	413	(621)
Deferred revenue	(80)	127
Due to related parties	(7)	(16)
Accrued expenses and other current liabilities	(1,435)	(1,392)
Operating lease liabilities, net	(7)	2
Net cash used in operating activities	(9,249)	(12,510)
Cash flows from investing activities:
Purchases of property and equipment	(472)	(145)
Net cash used in investing activities	(472)	(145)
Cash flows from financing activities:
Proceeds from exercise of stock options	33	55
Proceeds from shares issued under "at-the-market" offering program, net of selling costs	129
Proceeds from issuance of common stock and warrants, net of offering costs	5,420
Net cash provided by financing activities	5,582	55
Net decrease in cash and cash equivalents and restricted cash	(4,139)	(12,600)
Cash, cash equivalents and restricted cash, beginning of period	37,673	75,804
Cash, cash equivalents and restricted cash, end of period	33,534	63,204
Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets
Cash and cash equivalents	33,093	63,204
Restricted cash	441	0
Total cash, cash equivalents and restricted cash	33,534	63,204
Supplemental disclosure of noncash information:
Initial measurement of warrant liabilities	2,858
Unpaid purchase of property and equipment	509	$ 742
Unpaid financing issuance costs	$ 238