Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Income Statement [Abstract]
Total revenues	$ 11,320	$ 10,865	$ 31,133	$ 31,350
Cost of revenues	6,744	6,492	18,367	18,017
Gross profit	4,576	4,373	12,766	13,333
Operating expenses:
Research and development	1,149	1,320	3,154	4,028
Sales and marketing	4,144	3,769	12,362	10,346
General and administrative	2,343	2,530	7,209	6,804
Gain on sale of intellectual property		(175)		(175)
Total operating expenses	7,636	7,444	22,725	21,003
Loss from operations	(3,060)	(3,071)	(9,959)	(7,670)
Other (expense) income, net	(8)	(16)	16	(19)
Loss from operations before provision for income taxes	(3,068)	(3,087)	(9,943)	(7,689)
Provision for income taxes	6	9	14	23
Net loss	$ (3,074)	$ (3,096)	$ (9,957)	$ (7,712)
Net loss per share:
Basic	$ (0.26)	$ (0.27)	$ (0.85)	$ (0.67)
Diluted	$ (0.26)	$ (0.27)	$ (0.85)	$ (0.67)
Weighted average shares used in computing net loss per common share:
Basic	11,925	11,569	11,732	11,544
Diluted	11,925	11,569	11,732	11,544