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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Income Statement [Abstract]
Revenue	$ 3,194	$ 2,764
Cost of revenue	1,215	1,375
Gross profit	1,979	1,389
Operating expenses:
Research and development	3,242	2,699
Selling, general and administrative	2,446	2,561
Total operating expenses	5,688	5,260
Loss from operations	(3,709)	(3,871)
Interest expense	(83)	(24)
Interest income and other (expense), net	48	(14)
Loss before income taxes	(3,744)	(3,909)
(Benefit from) Provision for income taxes	(268)	61
Net loss	$ (3,476)	$ (3,970)
Net loss per share:
Basic and diluted	$ (0.04)	$ (0.05)
Weighted average shares outstanding:
Basic and diluted	96,824	80,571

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