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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Statement [Abstract]
Revenue	$ 3,510	$ 2,972	$ 9,396	$ 9,168
Cost of revenue	1,767	1,706	4,734	5,149
Gross profit	1,743	1,266	4,662	4,019
Operating expenses:
Research and development	2,461	2,368	7,526	7,114
Selling, general and administrative	2,509	2,353	7,680	7,381
Total operating expenses	4,970	4,721	15,206	14,495
Loss from operations	(3,227)	(3,455)	(10,544)	(10,476)
Interest expense	(21)	(15)	(77)	(97)
Interest income and other (expense), net	17	(3)	26	(2)
Loss before income taxes	(3,231)	(3,473)	(10,595)	(10,575)
Provision for income taxes	29	77	119	147
Net loss	$ (3,260)	$ (3,550)	$ (10,714)	$ (10,722)
Net loss per share:
Basic and Diluted	$ (0.03)	$ (0.04)	$ (0.12)	$ (0.14)
Weighted average shares outstanding:
Basic and Diluted	94,725	80,125	87,040	76,267

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