Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net loss	$ (5,111)	$ (2,234)
Loss from discontinued operations	0	19
Net loss (income) from continuing operations	(5,111)	(2,215)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	329	478
Amortization	85	68
Loss (gain) on disposal of equipment	0	(2)
Provision for doubtful accounts, net of recoveries	(1,082)	0
Intangible assets abandonment	0	51
Stock-based compensation, net of forfeitures	150	219
Changes in operating assets and liabilities:
Accounts receivable	1,863	3,870
Inventories	(78)	640
Prepaid expenses, other current assets and other non-current assets	424	1,163
Accounts payable	(531)	(5,595)
Accrued liabilities and other non-current liabilities	537	(1,485)
Net cash used in operating activities - continuing operations	(3,414)	(2,804)
Net cash used in operating activities - discontinued operations	0	(19)
Net cash used in operating activities	(3,414)	(2,823)
Investing Activities
Purchases of equipment and patents	(122)	(359)
Net cash used in investing activities - continuing operations	(122)	(359)
Financing Activities
Proceeds from borrowings	1,556	0
Taxes paid on behalf of equity award participants	(6)	(2)
Net cash used in financing activities	1,550	(2)
Effect of exchange rate fluctuations on cash	(258)	44
Net decrease in cash, cash equivalents and restricted cash	(2,244)	(3,140)
Cash, cash equivalents, and restricted cash at beginning of period (Note 2)	13,501	18,059
Cash, cash equivalents and restricted cash at end of period (Note 2)	$ 11,257	$ 14,919