Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Income Statement [Abstract]
Total revenues	$ 9,509	$ 10,483
Cost of revenues	5,587	6,018
Gross profit	3,922	4,465
Operating expenses:
Research and development	1,104	1,339
Sales and marketing	4,050	2,923
General and administrative	2,385	2,061
Total operating expenses	7,539	6,323
Loss from operations	(3,617)	(1,858)
Other income (expense), net	18	(2)
Loss from operations before provision for income taxes	(3,599)	(1,860)
Provision for income taxes	4	6
Net loss	$ (3,603)	$ (1,866)
Net loss per share:
Basic	$ (0.31)	$ (0.16)
Diluted	$ (0.31)	$ (0.16)
Weighted average shares used in computing net loss per common share:
Basic	11,628	11,518
Diluted	11,628	11,518