Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net loss	$ (1,442)	$ 54
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	352	584
Amortization	88	157
Loss on sale of equipment	0	54
Non-cash interest income on held-to-maturity securities	(5)	0
Provision for doubtful accounts, net of recoveries	(106)	(619)
Deferred income taxes	38	5
Stock-based compensation, net of forfeitures	224	82
Changes in operating assets and liabilities:
Accounts receivable	(4,448)	3,794
Inventories	(45)	(252)
Prepaid expenses, other current assets and other non-current assets	(314)	634
Accounts payable	1,159	(772)
Accrued liabilities and other non-current liabilities	360	(1,404)
Net cash (used in) provided by operating activities	(4,139)	761
INVESTING ACTIVITIES
Purchases of equipment and patents	(206)	(84)
Purchases of debt securities	(9,777)	0
Maturities of debt securities	500	0
Net cash used in investing activities	(9,483)	(84)
FINANCING ACTIVITIES
Proceeds from sale of common stock issued in connection with private placement	0	25,812
Costs related to sale of common stock issued in connection with private placement	0	(1,783)
Taxes paid on behalf of equity award participants	(17)	(52)
Net cash (used in) provided by financing activities	(17)	23,977
Effect of exchange rate fluctuations on cash	(87)	(206)
Net (decrease) increase in cash, cash equivalents and restricted cash	(13,726)	24,448
Cash, cash equivalents and restricted cash at beginning of period	37,054	12,606
Cash, cash equivalents and restricted cash at end of period	23,328	37,054
Supplemental Cash Flow Information:
Cash income taxes paid (received), net	14	(51)
Paycheck Protection Program CARES Act [Member]
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Gain of forgiveness on Paycheck Protection Plan Loan	$ 0	$ (1,556)