Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (4,522)	$ (1,989)
Loss from discontinued operations	0	(12)
Loss from continuing operations	(4,522)	(1,977)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	177	151
Stock-based compensation	207	256
Stock-based compensation reversal	(269)	0
Provision for doubtful accounts receivable	0	(27)
Provision for slow-moving and obsolete inventories and valuation reserves	162	(820)
Provision for warranties	13	16
Loss on dispositions of property and equipment	8	0
Changes in operating assets and liabilities:
Accounts Receivable	3,054	4,104
Inventories	866	(2,984)
Prepaid and other assets	(114)	(283)
Accounts payable	(1,649)	(1,373)
Accrued and other liabilities	248	(1,235)
Deferred revenue	174	(26)
Total adjustments	2,877	(2,221)
Net cash used in operating activities	(1,645)	(4,198)
Cash flows from investing activities:
Acquisitions of property and equipment	(29)	(311)
Net cash used in investing activities	(29)	(311)
Cash flows from financing activities:
Proceeds from exercises of stock options and employee stock purchase plan purchases	77	14
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units	(47)	0
Net cash provided by financing activities	30	14
Effect of exchange rate changes on cash	(15)	7
Net cash used in continuing operations	(1,659)	(4,488)
Cash flows of discontinued operations:
Operating cash flows, net	0	(12)
Net cash used in discontinued operations	0	(12)
Net decrease in cash and cash equivalents	(1,659)	(4,500)
Cash and cash equivalents, beginning of period	16,629	34,640
Cash and cash equivalents, end of period	14,970	30,140
Classification of cash and cash equivalents:
Cash and cash equivalents	14,628	29,798
Restricted cash held	342	342
Cash and cash equivalents, end of period	$ 16,629	$ 34,640