Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income (loss)	$ 54	$ (4,278)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	584	663
Amortization	157	185
Loss (gain) on sale of equipment	54	(5)
Provision for doubtful accounts, net of recoveries	(619)	(1,026)
Deferred income taxes	5	(38)
Stock-based compensation, net of forfeitures	82	290
Intangible assets abandonment	0	197
Changes in operating assets and liabilities:
Accounts receivable	3,794	1,095
Inventories	(252)	171
Prepaid expenses, other current assets and other non-current assets	634	(161)
Accounts payable	(772)	198
Accrued liabilities and other non-current liabilities	(1,404)	2
Net cash provided by (used in) operating activities	761	(2,707)
INVESTING ACTIVITIES
Purchases of equipment and patents	(84)	(247)
Net cash used in investing activities	(84)	(247)
FINANCING ACTIVITIES
Proceeds from sale of common stock issued in connection with private placement	25,812	0
Costs related to sale of common stock issued in connection with private placement	(1,783)	0
Proceeds from option exercises	0	296
Taxes paid on behalf of equity award participants	(52)	(570)
Net cash provided by financing activities	23,977	1,282
Effect of exchange rate fluctuations on cash	(206)	777
Net increase (decrease) in cash, cash equivalents and restricted cash	24,448	(895)
Cash, cash equivalents and restricted cash at beginning of period	12,606	13,501
Cash, cash equivalents and restricted cash at end of period	37,054	12,606
Supplemental Cash Flow Information:
Cash income taxes paid (received), net	(51)	95
Paycheck Protection Program CARES Act [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain of forgiveness on Paycheck Protection Plan Loan	(1,556)	0
FINANCING ACTIVITIES
Proceeds from borrowings	$ 0	$ 1,556