Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net loss	$ (9,777)	$ (8,284)
Loss from discontinued operations	2,238	2,144
Net loss from continuing operations	(7,539)	(6,140)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1,075	1,359
Amortization	161	834
Loss on disposal of equipment	158	59
Provision for doubtful accounts, net of recoveries	0	151
Excess and obsolete inventory reserve	228	0
Deferred income taxes	0	(11)
Building impairment	2,965	0
Stock-based compensation, net of forfeitures	1,207	1,520
Changes in operating assets and liabilities:
Accounts receivable	(1,691)	2,764
Inventories	78	654
Prepaid expenses, other current assets and other non-current assets	294	2,766
Accounts payable	2,726	(3,083)
Accrued liabilities and other non-current liabilities	(3,474)	(1,362)
Net cash used in operating activities - continuing operations	(3,812)	(489)
Net cash used in operating activities - discontinued operations	(1,723)	(1,693)
Net cash used in operating activities	(5,535)	(2,182)
Investing Activities
Purchases of equipment and patents	(511)	(453)
Proceeds from the sale of equipment	1	2
Net cash used in investing activities	(510)	(451)
Financing Activities
Change in restricted cash	0	(6,020)
Taxes paid on behalf of equity award participants	(258)	(172)
Net cash used in financing activities	(258)	(6,192)
Effect of exchange rate fluctuations on cash	607	473
Net decrease in cash and cash equivalents	(5,696)	(8,352)
Cash and cash equivalents at beginning of period	11,826	21,684
Cash and cash equivalents at end of period	$ 6,130	$ 13,332