Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net loss	$ (1,969)	$ (9,360)
Loss from discontinued operations	99	1,999
Net loss from continuing operations	(1,870)	(7,361)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	355	755
Amortization	106	109
Loss on disposal of equipment	17	114
Provision for doubtful accounts, net of recoveries	(62)	30
Excess and obsolete inventory reserve	0	228
Intangible assets abandonment and building impairment	317	2,965
Stock-based compensation, net of forfeitures	38	1,156
Changes in operating assets and liabilities:
Accounts receivable	(1,766)	(110)
Inventories	213	(570)
Prepaid expenses, other current assets and other non-current assets	229	16
Accounts payable	714	(1,591)
Accrued liabilities and other non-current liabilities	(1,760)	323
Net cash used in operating activities - continuing operations	(3,469)	(3,936)
Net cash used in operating activities - discontinued operations	(43)	(1,316)
Net cash used in operating activities	(3,512)	(5,252)
Investing Activities
Purchases of equipment and patents	(214)	(233)
Proceeds from the sale of equipment	2	1
Net cash used in investing activities	(212)	(232)
Financing Activities
Taxes paid on behalf of equity award participants	(13)	(258)
Net cash used in financing activities	(13)	(258)
Effect of exchange rate fluctuations on cash	(217)	492
Net decrease in cash, cash equivalents and restricted cash	(3,954)	(5,250)
Cash, cash equivalents, and restricted cash at beginning of period (Note 2)	14,386	17,846
Cash, cash equivalents and restricted cash at end of period (Note 2)	$ 10,432	$ 12,596