Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Oct. 01, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accumulated depreciation on property and equipment	$ 8,966,000	$ 7,290,000
Accumulated amortization on Patents, licenses and purchased technology	$ 927,000	$ 869,000
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	330,369	330,873
Preferred stock, shares outstanding	330,369	330,873
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	3,276,782	2,640,547
Common stock, shares outstanding	3,276,782	2,640,547