Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net loss	$ (28)	$ (10,449)	$ (17,388)
Loss from discontinued operations	113	3,914	2,800
Net income (loss) from continuing operations	85	(6,535)	(14,588)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	654	1,312	1,780
Amortization	193	215	1,118
Loss on disposal of equipment	142	304	60
Provision for doubtful accounts, net of recoveries	(64)	0	(111)
Deferred income taxes	2	(534)	1,196
Stock-based compensation, net of forfeitures	233	1,389	1,991
Intangible assets abandonment and building impairment	317	2,965	2,074
Excess and obsolete inventory provision	78	228	825
Changes in operating assets and liabilities:
Accounts receivable	848	113	3,522
Inventories	(108)	(134)	446
Prepaid expenses, other current assets and other non-current assets	251	(1,084)	2,893
Accounts payable	521	2,500	(2,445)
Accrued liabilities and other non-current liabilities	1,897	(2,439)	699
Net cash provided by operating activities - continuing operations	5,049	(1,700)	(540)
Net cash used in operating activities - discontinued operations	(122)	(1,868)	(2,198)
Net cash provided by operating activities	4,927	(3,568)	(2,738)
INVESTING ACTIVITIES
Purchases of equipment and patents	(570)	(492)	(940)
Proceeds from the sale of equipment	1	2	2
Net cash used in investing activities	(569)	(490)	(938)
FINANCING ACTIVITIES
Taxes paid on behalf of equity award participants	(12)	(258)	(172)
Net cash used in financing activities	(12)	(258)	(172)
Effect of exchange rate fluctuations on cash	(673)	856	10
Net increase (decrease) in cash, cash equivalents and restricted cash	3,673	(3,460)	(3,838)
Cash, cash equivalents and restricted cash at beginning of period	14,386	17,846	21,684
Cash, cash equivalents and restricted cash at end of period	18,059	14,386	17,846
Cash paid for:
Interest	0	0	0
Income taxes paid	$ 27	$ 31	$ 368