Stock-Based Compensation - Schedule of Stock Options Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 03, 2016 USD ($) $ / shares shares
Number of Shares
Balance outstanding at beginning of period, (in shares) | shares	5,266
Forfeited or expired, (in shares) | shares	(373)
Balance outstanding at end of period, (in shares) | shares	4,893
Exercisable, (in shares) | shares	4,542
Vested and expected to vest, (in shares) | shares	4,838
Weighted Average Exercise Price
Balance outstanding at beginning of period, (in dollars per share) | $ / shares	$ 2.64
Forfeited or expired, (in dollars per share) | $ / shares	2.74
Balance outstanding at end of period, (in dollars per share) | $ / shares	2.63
Exercisable, (in dollars per share) | $ / shares	2.62
Vested and expected to vest, (in dollars per share) | $ / shares	$ 2.63
Weighted Average Remaining Term
Balance outstanding	3 years 9 months 25 days
Exercisable	3 years 6 months
Vested and expected to vest	3 years 9 months 7 days
Aggregate Intrinsic Value
Balance outstanding | $	$ 17
Exercisable | $	17
Vested and expected to vest | $	$ 17