Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Income Statement [Abstract]
Total revenues	$ 6,219	$ 10,426	$ 15,240	$ 21,021
Cost of revenues	3,813	5,877	8,918	12,215
Gross profit	2,406	4,549	6,322	8,806
Operating expenses:
Research and development	807	929	1,526	1,887
Sales and marketing	2,693	3,462	5,845	7,553
General and administrative	1,690	2,626	3,388	4,870
Total operating expenses	5,190	7,017	10,759	14,310
Loss from operations	(2,784)	(2,468)	(4,437)	(5,504)
Other income (expense), net	9	58	18	52
Loss from operations before provision for income taxes	(2,775)	(2,410)	(4,419)	(5,452)
Provision for income taxes	5	9	12	15
Net loss	$ (2,780)	$ (2,419)	$ (4,431)	$ (5,467)
Net loss per share:
Basic	$ (0.20)	$ (0.18)	$ (0.32)	$ (0.40)
Diluted	$ (0.20)	$ (0.18)	$ (0.32)	$ (0.40)
Weighted average shares used in computing net loss per common share:
Basic	13,792	13,648	13,789	13,639
Diluted	13,792	13,648	13,789	13,639