Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jul. 01, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accumulated depreciation on property and equipment	$ 10,363,000	$ 9,350,000
Accumulated amortization on Patents, licenses and purchased technology	$ 963,000	$ 948,000
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	328,925	333,767
Preferred stock, shares outstanding	328,925	333,767
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	10,724,261	7,353,714
Common stock, shares outstanding	10,724,261	7,353,714