Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Income Statement [Abstract]
Total revenues	$ 46,158	$ 41,757	$ 42,814
Cost of revenues	25,319	21,804	21,409
Gross profit	20,839	19,953	21,405
Operating expenses:
Research and development	5,365	5,214	4,629
Sales and marketing	10,281	8,901	8,155
General and administrative	7,638	5,550	6,034
Impairment of intangible assets	120
Total operating expenses	23,404	19,665	18,818
(Loss) income from operations	(2,565)	288	2,587
Other (expense) income, net	(91)	3	(1,255)
(Loss) income from operations before provision for (benefit from) income taxes	(2,656)	291	1,332
Provision for (benefit from) income taxes	9,057	(183)	(8,706)
Net (loss) income	$ (11,713)	$ 474	$ 10,038
Net (loss) income per share:
Basic	$ (1.15)	$ 0.05	$ 1.01
Diluted	$ (1.15)	$ 0.05	$ 0.97
Weighted average shares used in computing net (loss) income per common share:
Basic	10,173	9,962	9,892
Diluted	10,173	10,128	10,357