Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities
Net loss	$ (1,354)	$ (380)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation	182	319
Amortization	50	71
Loss on disposal of equipment	0	13
Provision for doubtful accounts, net of recoveries	43	23
Stock-based compensation, net of forfeitures	46	40
Changes in operating assets and liabilities:
Accounts receivable	(3,245)	3,079
Inventories	(58)	(97)
Prepaid expenses, other current assets and other non-current assets	205	681
Accounts payable	812	(943)
Accrued liabilities and other non-current liabilities	(2)	(1,021)
Net cash (used in) provided by operating activities	(3,321)	229
Investing Activities
Purchases of equipment and patents	(138)	(237)
Net cash used in investing activities	(138)	(237)
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	(280)	(13)
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents	(3,756)	23,956
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)	33,298	36,562
Paycheck Protection Program CARES Act [Member]
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Gain of forgiveness on Paycheck Protection Plan Loan	$ 0	$ (1,556)