Stock-Based Compensation - Schedule of Stock Options Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 27, 2015 USD ($) $ / shares shares
Number of Shares
Balance outstanding at beginning of period, (in shares)	5,682
Granted, in shares (in shares)	80
Forfeited or expired, (in shares)	(495)
Exercised, (in shares)	(119)
Balance outstanding at end of period, (in shares)	5,148
Exercisable, (in shares)	4,424
Vested and expected to vest, (in shares)	5,148
Weighted Average Exercise Price
Balance outstanding at beginning of period, (in dollars per share) | $ / shares	$ 2.67
Granted, (in dollars per share) | $ / shares	2.00
Forfeited or expired, (in dollars per share) | $ / shares	2.86
Exercised, (in dollars per share) | $ / shares	0.98
Balance outstanding at end of period, (in dollars per share) | $ / shares	2.68
Exercisable, (in dollars per share) | $ / shares	2.62
Vested and expected to vest, (in dollars per share) | $ / shares	$ 2.68
Weighted Average Remaining Term
Balance outstanding	4 years 10 months 2 days
Exercisable	4 years 3 months 8 days
Vested and expected to vest	4 years 10 months 2 days
Aggregate Intrinsic Value
Balance outstanding | $	$ 322
Exercisable | $	322
Vested and expected to vest | $	$ 322