Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Operating Activities
Net loss	$ (11,165)	$ (20,209)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation and amortization	310	362
Stock-based compensation expense	478	670
Change in fair value of warrant liability	(4,615)	(758)
Loss on disposal of intangible asset	99	0
Financing expense	5,607	3,483
Net realized and unrealized gains on marketable securities	0	(65)
Changes in operating assets and liabilities:
Accounts receivable	224	(545)
Inventory	279	697
Other current assets	(160)	(65)
Other assets and liabilities	(22)	(7)
Accounts payable and accrued expenses	(626)	(1,500)
Net cash used in operating activities	(9,591)	(17,937)
Investing Activities:
Addition of intangible asset	0	(99)
Proceeds from sales of marketable securities	0	578
Purchase of property and equipment	(60)	(149)
Net cash (used in) provided by investing activities	(60)	330
Financing Activities:
Proceeds from April 2024 common stock offering, net	2,403	2,109
Proceeds from exercise of Series J Convertible Preferred Warrants	501	1,482
Proceeds from exercise of April 2024 Warrants, net	2,246	0
Proceeds from issuance of July and August 2024 Common Stock and Warrants, net	2,160	0
Proceeds from warrant inducement in November 2024, net	3,364	0
Proceeds from the exercise of warrants, net	288	120
Payments on finance lease liability	0	(28)
Net cash provided by financing activities	10,962	3,683
Effect of exchange rate changes on cash	(16)	(13)
Net increase/(decrease) in cash and cash equivalents	1,295	(13,937)
Cash and cash equivalents - beginning of year	3,800	17,737
Cash and cash equivalents - end of year	5,095	3,800
Supplemental schedule of non-cash activities
Inventory transferred to property, plant and equipment	0	41
Issuance of Common Stock for exercise of Series I Warrants	0	7,623
Issuance of Series J Preferred Stock for exercise of warrants	1,857	2,927
Reclassification of April 2024 warrants to equity	4,217	0
Deemed dividend on Series J Preferred Stock	541	(2,297)
Issuance of Common Stock for conversion of Series J Preferred Stock	1,535	0
Series J Preferred Stock issued for payment in kind dividend	0	121
Supplemental cash flow information
Cash paid for income taxes	$ 7	$ 12