Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Reserves for accounts receivable	$ 746	$ 736
Common stock, par value	$ 0.002	$ 0.002
Common stock, shares authorized	140,000,000	140,000,000
Common stock, shares issued	85,052,000	84,856,000