Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities
Net income (loss)	$ 398	$ (2,567)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	168	163
Amortization	34	43
Loss on disposal of equipment	2
Provision for doubtful accounts, net of recoveries	47
Stock-based compensation, net of forfeitures	20	81
Gain of forgiveness on Paycheck Protection Plan Loan	(1,556)
Changes in operating assets and liabilities:
Accounts receivable	1,831	795
Inventories	(59)	(104)
Prepaid expenses, other current assets and other non-current assets	422	99
Accounts payable	(874)	(313)
Accrued liabilities and other non-current liabilities	(658)	(102)
Net cash used in operating activities	(225)	(1,905)
Investing Activities
Purchases of equipment and patents	(4)	(14)
Net cash used in investing activities	(4)	(14)
Financing Activities
Proceeds from sale of common stock issued in connection with private placement	25,812
Costs related to sale of common stock issued in connection with private placement	(1,783)
Taxes paid on behalf of equity award participants	(52)	(5)
Net cash provided by (used in) financing activities	23,977	(5)
Effect of exchange rate fluctuations on cash	(223)	(441)
Net increase (decrease) in cash, cash equivalents and restricted cash	23,525	(2,365)
Cash, cash equivalents, and restricted cash at beginning of period (Note 2)	12,606	13,501
Cash, cash equivalents and restricted cash at end of period (Note 2)	$ 36,131	$ 11,136