Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 3,800	$ 17,737
Marketable securities	0	569
Accounts receivable	1,951	1,406
Inventories, net	1,997	2,661
Other current assets	461	396
Total current assets	8,209	22,769
Property, plant and equipment, net	728	980
Operating lease right-of-use asset	713	903
Other assets	120	21
TOTAL ASSETS	9,770	24,673
Current liabilities
Accounts payable and accrued liabilities	2,380	2,245
Accrued compensation	525	2,161
Current portion of operating lease liability	216	196
Current portion of finance lease liability	0	28
Other current liabilities	51	58
Total current liabilities	3,172	4,688
Common stock warrant liability	2,843	6,868
Operating lease liability	544	760
Total liabilities	6,559	12,316
Commitments and contingencies
Mezzanine Equity
Series J Convertible Preferred Stock as of December 31, 2023 and December 31, 2022, par value $0.0001 per share; authorized 600,000 and none, issued and outstanding 11,950 and none, respectively	221	0
Stockholders' equity
Preferred stock	0	0
Common stock as of December 31, 2023 and December 31, 2022, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 5,682,461 and 536,394, respectively	1	0
Additional paid-in capital	290,646	279,736
Accumulated other comprehensive income:
Foreign currency translation adjustment	(31)	(18)
Unrealized gain (loss) on marketable securities	0	56
Accumulated deficit	(287,626)	(267,417)
Total stockholders' equity	2,990	12,357
TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY	9,770	24,673
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity
Preferred stock	0	0
Series F Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock	0	0
Series I Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0