Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net loss	$ (9,360)	$ (5,265)
Loss from discontinued operations	1,999	1,514
Net loss from continuing operations	(7,361)	(3,751)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	755	926
Amortization	109	560
Loss on disposal of equipment	114	26
Provision for doubtful accounts, net of recoveries	30	151
Excess and obsolete inventory reserve	228	0
Deferred income taxes	0	(10)
Building impairment	2,965	0
Stock-based compensation, net of forfeitures	1,156	1,041
Changes in operating assets and liabilities:
Accounts receivable	(110)	173
Inventories	(570)	149
Prepaid expenses, other current assets and other non-current assets	16	2,861
Accounts payable	(1,591)	(1,630)
Accrued liabilities and other non-current liabilities	323	(1,482)
Net cash used in operating activities - continuing operations	(3,936)	(986)
Net cash used in operating activities - discontinued operations	(1,316)	(1,213)
Net cash used in operating activities	(5,252)	(2,199)
Investing Activities
Purchases of equipment and patents	(233)	(302)
Proceeds from the sale of equipment	1	1
Net cash used in investing activities	(232)	(301)
Financing Activities
Change in restricted cash	0	(7,020)
Taxes paid on behalf of equity award participants	(258)	(172)
Net cash used in financing activities	(258)	(7,192)
Effect of exchange rate fluctuations on cash	492	434
Net decrease in cash and cash equivalents	(5,250)	(9,258)
Cash and cash equivalents at beginning of period	11,826	21,684
Cash and cash equivalents at end of period	$ 6,576	$ 12,426