Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Income Statement [Abstract]
Total revenues	$ 10,002	$ 11,908	$ 20,485	$ 23,839
Cost of revenues	5,507	6,174	11,525	12,808
Gross profit	4,495	5,734	8,960	11,031
Operating expenses:
Research and development	1,528	1,392	3,024	2,751
Sales and marketing	3,654	2,405	6,577	4,834
General and administrative	2,054	2,331	3,958	3,688
Total operating expenses	7,236	6,128	13,559	11,273
Loss from operations	(2,741)	(394)	(4,599)	(242)
Other expense, net	(1)	(21)	(3)	(32)
Loss from operations before provision for (benefit from) income taxes	(2,742)	(415)	(4,602)	(274)
Provision for (benefit from) income taxes	8	(87)	14	(47)
Net loss	$ (2,750)	$ (328)	$ (4,616)	$ (227)
Net loss per share:
Basic	$ (0.24)	$ (0.03)	$ (0.40)	$ (0.02)
Diluted	$ (0.24)	$ (0.03)	$ (0.40)	$ (0.02)
Weighted average shares used in computing net loss per common share:
Basic	11,546	10,085	11,532	10,060
Diluted	11,546	10,085	11,532	10,060