Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net loss	$ (1,289)	$ (216)
Loss from discontinued operations	10	25
Net loss from continuing operations	(1,279)	(191)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	244	195
Amortization	32	53
Loss on disposal of equipment	0	15
Provision for doubtful accounts, net of recoveries	0	(62)
Stock-based compensation, net of forfeitures	96	(59)
Changes in operating assets and liabilities:
Accounts receivable	720	32
Inventories	154	(68)
Prepaid expenses, other current assets and other non-current assets	187	113
Accounts payable	(3,174)	186
Accrued liabilities and other non-current liabilities	(1,870)	(2,751)
Net cash used in operating activities - continuing operations	(4,890)	(2,537)
Net cash used in operating activities - discontinued operations	(10)	(25)
Net cash used in operating activities	(4,900)	(2,562)
Investing Activities
Purchases of equipment and patents	(279)	(62)
Proceeds from the sale of equipment	55	2
Net cash used in investing activities	(224)	(60)
Financing Activities
Taxes paid on behalf of equity award participants	(2)	(10)
Net cash used in financing activities	(2)	(10)
Effect of exchange rate fluctuations on cash	222	433
Net decrease in cash, cash equivalents and restricted cash	(4,904)	(2,199)
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)	$ 13,155	$ 12,187