Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating Activities
Net loss	$ (380)	$ (5,111)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	319	329
Amortization	71	85
Loss on disposal of equipment	13	0
Provision for doubtful accounts, net of recoveries	23	(1,082)
Stock-based compensation, net of forfeitures	40	150
Gain on forgiveness of Paycheck Protection Plan Loan	(1,556)	0
Changes in operating assets and liabilities:
Accounts receivable	3,079	1,863
Inventories	(97)	(78)
Prepaid expenses, other current assets and other non-current assets	681	424
Accounts payable	(943)	(531)
Accrued liabilities and other non-current liabilities	(1,021)	537
Net cash provided by (used in) operating activities	229	(3,414)
Investing Activities
Purchases of equipment and patents	(237)	(122)
Net cash used in investing activities	(237)	(122)
Financing Activities
Proceeds from borrowings	0	1,556
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
Taxes paid on behalf of equity award participants	(52)	(6)
Net cash provided by financing activities	23,977	1,550
Effect of exchange rate fluctuations on cash	(13)	(258)
Net increase (decrease) in cash, cash equivalents and restricted cash	23,956	(2,244)
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)	$ 36,562	$ 11,257