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Stock-Based Compensation - Schedule of Stock Options Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Oct. 01, 2017
USD ($)
$ / shares
shares
Number of Shares  
Balance outstanding at beginning of period, (in shares) | shares 4,979
Forfeited or expired, (in shares) | shares (942)
Exercised (in shares) | shares (62)
Balance outstanding at end of period, (in shares) | shares 3,975
Exercisable, (in shares) | shares 3,345
Vested and expected to vest, (in shares) | shares 3,838
Weighted Average Exercise Price  
Balance outstanding at beginning of period, (in dollars per share) | $ / shares $ 2.35
Forfeited or expired, (in dollars per share) | $ / shares 2.61
Exercised (in dollars per share) | $ / shares 1.33
Balance outstanding at end of period, (in dollars per share) | $ / shares 2.30
Exercisable, (in dollars per share) | $ / shares 2.53
Vested and expected to vest, (in dollars per share) | $ / shares $ 2.35
Weighted Average Remaining Term  
Balance outstanding 4 years 1 month 13 days
Exercisable 3 years 3 months 4 days
Vested and expected to vest 3 years 11 months 12 days
Aggregate Intrinsic Value  
Balance outstanding | $ $ 880
Exercisable | $ 422
Vested and expected to vest | $ $ 774