CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Net revenues:
Systems and components	$ 24,537	$ 20,961	$ 82,822	$ 47,326
Technology development	2,189	1,598	5,255	3,816
Total net revenues	26,726	22,559	88,077	51,142
Cost of net revenues:
Systems and components	13,402	13,025	47,419	29,490
Technology development	2,026	1,019	4,842	3,155
Total cost of net revenues	15,428	14,044	52,261	32,645
Gross profit	11,298	8,515	35,816	18,497
Operating expenses:
Research and development	4,535	4,067	13,635	14,220
Selling, general and administrative	5,495	4,772	17,482	14,724
Total operating expenses	10,030	8,839	31,117	28,944
Income (loss) from operations	1,268	(324)	4,699	(10,447)
Interest income and other income (expense), net	28	60	265	184
Income (loss) before income taxes	1,296	(264)	4,964	(10,263)
Provision for income taxes	66	217	805	13
Net income (loss)	$ 1,230	$ (481)	$ 4,159	$ (10,276)
Net income (loss) per share:
Basic	$ 0.06	$ (0.02)	$ 0.19	$ (0.50)
Diluted	$ 0.05	$ (0.02)	$ 0.18	$ (0.50)
Weighted average common shares outstanding:
Basic	21,714	20,869	21,475	20,704
Diluted	22,970	20,869	22,989	20,704