Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net loss	$ (2,567)	$ (1,289)
Loss from discontinued operations	0	10
Net loss from continuing operations	(2,567)	(1,279)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	163	244
Amortization	43	32
Stock-based compensation, net of forfeitures	81	96
Changes in operating assets and liabilities:
Accounts receivable	795	720
Inventories	(104)	154
Prepaid expenses, other current assets and other non-current assets	99	187
Accounts payable	(313)	(3,174)
Accrued liabilities and other non-current liabilities	(102)	(1,870)
Net cash used in operating activities - continuing operations	(1,905)	(4,890)
Net cash used in operating activities - discontinued operations	0	(10)
Net cash used in operating activities	(1,905)	(4,900)
Investing Activities
Purchases of equipment and patents	(14)	(279)
Proceeds from the sale of equipment	0	55
Net cash used in investing activities - continuing operations	(14)	(224)
Financing Activities
Taxes paid on behalf of equity award participants	(5)	(2)
Net cash used in financing activities	(5)	(2)
Effect of exchange rate fluctuations on cash	(441)	222
Net decrease in cash, cash equivalents and restricted cash	(2,365)	(4,904)
Cash, cash equivalents, and restricted cash at beginning of period (Note 2)	13,501	18,059
Cash, cash equivalents and restricted cash at end of period (Note 2)	$ 11,136	$ 13,155