Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 28, 2015	Dec. 28, 2014
Statement of Financial Position [Abstract]
Undesignated preferred stock, par value	$ 0.001	$ 0.001
Undesignated preferred stock, shares authorized	10,000,000	10,000,000
Undesignated preferred stock, shares issued	0	0
Undesignated preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	153,565,809	151,833,334
Common stock, shares outstanding	153,565,809	151,833,334