Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net loss	$ (60)	$ (999)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation	248	247
Amortization	42	46
Non-cash interest income on held-to-maturity securities	(109)	(319)
Stock-based compensation, net of forfeitures	337	288
Changes in operating assets and liabilities:
Accounts receivable	(845)	5
Employee retention credit receivable	(1,677)	0
Inventory	(3)	68
Prepaid expenses, other current assets and other non-current assets	655	363
Accounts payable	842	172
Accrued liabilities and other non-current liabilities	(1,215)	520
Net cash (used in) provided by operating activities	(1,785)	391
Investing Activities
Purchases of equipment and patents	(316)	(201)
Purchases of debt securities	(14,072)	(14,026)
Maturities of debt securities	11,000	4,000
Net cash used in investing activities	(3,388)	(10,227)
Financing Activities
Taxes paid on behalf of award participants	(95)	0
Proceeds from exercise of stock options	0	42
Net cash (used in) provided by financing activities	(95)	42
Effect of exchange rate fluctuations on cash	(36)	(51)
Net decrease in cash and cash equivalents	(5,304)	(9,845)
Cash and cash equivalents at beginning of period	17,578	23,328
Cash and cash equivalents at end of period	$ 12,274	$ 13,483