Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows used in operating activities
Net loss	$ (6,228)	$ (6,754)
Adjustments to reconcile net loss to net cash used in operating activities
Deferred tax benefits	(116)	(164)
Unrealized (gain) loss on the fair value of investments in bonds held to maturity	(229)	67
Accretion of bond discount	(15)	(224)
Stock-based compensation	881	1,600
Provision for bad debt	213	64
Recovery of bad debt		(8)
Inventory valuation adjustments	744	480
Amortization of right-of-use assets, operating assets	236	276
Depreciation and amortization	1,011	913
Impairment on right-of-use assets		83
Changes in assets and liabilities
Accounts receivable	416	(1,400)
Inventories	(1,424)	(1,598)
Prepaid expenses and other current assets	64	(278)
Accounts payable	28	505
Accrued expenses	96	445
Accrued director’s compensation	160	(5)
Operating lease obligations	(329)	(367)
Customer deposits and deferred revenue	493	373
Net cash used in operating activities	(3,999)	(5,992)
Cash flows used in investing activities
Cash used for investments held to maturity	(949)	(10,763)
Cash used in asset acquisition		(269)
Proceeds from bond redemption	950
Cash used for property and equipment	(519)	(502)
Net cash used in investing activities	(518)	(11,534)
Cash flows used in financing activities
Principal payments made on notes payable	(280)	(409)
Net cash used in financing activities	(280)	(409)
Effect of exchange rate changes on cash	(472)	(452)
Net decrease in cash and cash equivalents	(5,269)	(18,387)
Cash and cash equivalents, beginning of the period	8,482	25,627
Cash and cash equivalents, end of the period	3,213	7,240
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	12	11
Supplemental disclosure of non-cash information:
Notes payable	510	523
Common stock issued in connection with:
Compensation awards previously accrued	160	200
ROU assets and operating lease obligations recognized (Note 9):
Operating lease assets recognized
Less: non-cash changes to operating lease assets
Amortization	(236)	(276)
Impairment		(83)
Loss on lease impairment		83
ROU assets and operating lease obligations recognized	(236)	(276)
Operating lease liabilities recognized
Less: non-cash changes to operating lease liabilities accretion	(329)	(367)
Operating lease liabilities recognized	$ (329)	$ (367)