Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Total revenues	$ 8,803	$ 10,664	$ 24,043	$ 31,685
Cost of revenues	5,149	6,381	14,067	18,596
Gross profit	3,654	4,283	9,976	13,089
Operating expenses:
Research and development	869	1,007	2,395	2,894
Sales and marketing	2,959	3,508	8,804	11,061
General and administrative	1,672	1,621	5,060	6,491
Total operating expenses	5,500	6,136	16,259	20,446
Loss from operations	(1,846)	(1,853)	(6,283)	(7,357)
Other income, net	135	75	153	127
Loss from operations before provision for income taxes	(1,711)	(1,778)	(6,130)	(7,230)
Provision for income taxes	8	7	20	22
Net loss	$ (1,719)	$ (1,785)	$ (6,150)	$ (7,252)
Net loss per share:
Basic	$ (0.12)	$ (0.13)	$ (0.44)	$ (0.53)
Diluted	$ (0.12)	$ (0.13)	$ (0.44)	$ (0.53)
Weighted average shares used in computing net loss per common share:
Basic	13,893	13,768	13,824	13,682
Diluted	13,893	13,768	13,824	13,682