Stock-Based Compensation - Schedule of Stock Options Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Oct. 02, 2016 USD ($) $ / shares shares
Number of Shares
Balance outstanding at beginning of period, (in shares) | shares	5,266
Granted (in shares) | shares	842
Forfeited or expired, (in shares) | shares	(546)
Balance outstanding at end of period, (in shares) | shares	5,562
Exercisable, (in shares) | shares	4,494
Vested and expected to vest, (in shares) | shares	5,263
Weighted Average Exercise Price
Balance outstanding at beginning of period, (in dollars per share) | $ / shares	$ 2.64
Granted (in shares) | $ / shares	0.86
Forfeited or expired, (in dollars per share) | $ / shares	2.79
Balance outstanding at end of period, (in dollars per share) | $ / shares	2.36
Exercisable, (in dollars per share) | $ / shares	2.62
Vested and expected to vest, (in dollars per share) | $ / shares	$ 2.43
Weighted Average Remaining Term
Balance outstanding	4 years 1 month 10 days
Exercisable	2 years 9 months 26 days
Vested and expected to vest	3 years 9 months 15 days
Aggregate Intrinsic Value
Balance outstanding | $	$ 0
Exercisable | $	0
Vested and expected to vest | $	$ 0