Employee Stock Purchase Plan Activities (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Employee Stock Purchase Plan [Line Items]
Shares purchased	384	374	444
Weighted-average purchase price per share	$ 3.78	$ 3.90	$ 3.63
Aggregate intrinsic value of purchase rights exercised	$ 514	$ 688	$ 1,444