CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Net revenues:
Total net revenues	$ 19,466	$ 26,726	$ 63,538	$ 88,077
Cost of net revenues:
Total cost of net revenues	11,980	15,428	41,416	52,261
Gross profit	7,486	11,298	22,122	35,816
Operating expenses:
Research and development	3,737	4,535	12,889	13,635
Selling, general and administrative	4,842	5,495	15,382	17,482
Total operating expenses	8,579	10,030	28,271	31,117
Income (loss) from operations	(1,093)	1,268	(6,149)	4,699
Interest income and other income (expense), net	186	28	464	265
Income (loss) before income taxes	(907)	1,296	(5,685)	4,964
Provision for income taxes	192	66	717	805
Net income (loss)	$ (1,099)	$ 1,230	$ (6,402)	$ 4,159
Net income (loss) per share:
Basic	$ (0.05)	$ 0.06	$ (0.29)	$ 0.19
Diluted	$ (0.05)	$ 0.05	$ (0.29)	$ 0.18
Weighted average common shares outstanding:
Basic	22,719	21,714	22,429	21,475
Diluted	22,719	22,970	22,429	22,989
Systems and components
Net revenues:
Total net revenues	$ 17,140	$ 24,537	$ 55,947	$ 82,822
Cost of net revenues:
Total cost of net revenues	9,765	13,402	34,362	47,419
Technology development
Net revenues:
Total net revenues	2,326	2,189	7,591	5,255
Cost of net revenues:
Total cost of net revenues	$ 2,215	$ 2,026	$ 7,054	$ 4,842