Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net (loss) income	$ (1,040)	$ 298
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	267	457
Amortization	70	114
Loss on disposal of equipment	0	13
Provision for doubtful accounts, net of recoveries	(45)	(2)
Stock-based compensation, net of forfeitures	136	61
Changes in operating assets and liabilities:
Accounts receivable	(3,449)	1,405
Inventories	(44)	(32)
Prepaid expenses, other current assets and other non-current assets	370	1,176
Accounts payable	1,094	(980)
Accrued liabilities and other non-current liabilities	50	(382)
Net cash (used in) provided by operating activities	(2,591)	572
Investing Activities
Purchases of equipment and patents	(186)	(584)
Purchases of debt securities	(9,777)	0
Net cash used in investing activities	(9,963)	(584)
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	(401)	(249)
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents	(12,972)	23,716
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period (Note 2)	37,054	12,606
Cash, cash equivalents and restricted cash and cash equivalents at end of period (Note 2)	24,082	36,322
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)