Stock-Based Compensation - Schedule of Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Number of Shares
Balance outstanding at beginning of period, (in shares)	4,979
Forfeited or expired, (in shares)	(80)
Exercised (in shares)		(53)
Balance outstanding at end of period, (in shares)	4,846
Exercisable, (in shares)	3,976
Vested and expected to vest, (in shares)	4,685
Weighted Average Exercise Price
Balance outstanding at beginning of period, (in dollars per share)	$ 2.35
Forfeited or expired, (in dollars per share)	3.01
Exercised (in dollars per share)		$ 1.31
Balance outstanding at end of period, (in dollars per share)	2.35
Exercisable, (in dollars per share)	2.61
Vested and expected to vest, (in dollars per share)	$ 2.39
Weighted Average Remaining Term
Balance outstanding	3 years 10 months 17 days
Exercisable	2 years 8 months 27 days
Vested and expected to vest	3 years 8 months 12 days
Aggregate Intrinsic Value
Balance outstanding	$ 1,136
Exercisable	449
Vested and expected to vest	$ 999