Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net loss	$ (2,234)	$ (1,969)
Loss from discontinued operations	19	99
Net loss from continuing operations	(2,215)	(1,870)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	478	355
Amortization	68	106
Loss on disposal of equipment	2	17
Provision for doubtful accounts, net of recoveries	0	(62)
Asset Impairment Charges	51	317
Stock-based compensation, net of forfeitures	219	38
Changes in operating assets and liabilities:
Accounts receivable	3,870	(1,766)
Inventories	640	213
Prepaid expenses, other current assets and other non-current assets	1,163	229
Accounts payable	(5,595)	714
Accrued liabilities and other non-current liabilities	(1,485)	(1,760)
Net cash used in operating activities - continuing operations	(2,804)	(3,469)
Net cash used in operating activities - discontinued operations	(19)	(43)
Net cash used in operating activities	(2,823)	(3,512)
Investing Activities
Purchases of equipment and patents	(359)	(214)
Proceeds from the sale of equipment	0	2
Net cash used in investing activities	(359)	(212)
Financing Activities
Taxes paid on behalf of equity award participants	(2)	(13)
Net cash used in financing activities	(2)	(13)
Effect of exchange rate fluctuations on cash	44	(217)
Net decrease in cash, cash equivalents and restricted cash	(3,140)	(3,954)
Cash, cash equivalents, and restricted cash at beginning of period (Note 2)	18,059	14,386
Cash, cash equivalents and restricted cash at end of period (Note 2)	$ 14,919	$ 10,432