Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Statement [Abstract]
Total revenues	$ 10,664	$ 11,320	$ 31,685	$ 31,133
Cost of revenues	6,381	6,744	18,596	18,367
Gross profit	4,283	4,576	13,089	12,766
Operating expenses:
Research and development	1,007	1,149	2,894	3,154
Sales and marketing	3,508	4,144	11,061	12,362
General and administrative	1,621	2,343	6,491	7,209
Total operating expenses	6,136	7,636	20,446	22,725
Loss from operations	(1,853)	(3,060)	(7,357)	(9,959)
Other income (expense), net	75	(8)	127	16
Loss from operations before provision for income taxes	(1,778)	(3,068)	(7,230)	(9,943)
Provision for income taxes	7	6	22	14
Net loss	$ (1,785)	$ (3,074)	$ (7,252)	$ (9,957)
Net loss per share:
Basic	$ (0.13)	$ (0.26)	$ (0.53)	$ (0.85)
Diluted	$ (0.13)	$ (0.26)	$ (0.53)	$ (0.85)
Weighted average shares used in computing net loss per common share:
Basic	13,768	11,925	13,682	11,732
Diluted	13,768	11,925	13,682	11,732