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Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Sep. 29, 2017 | Sep. 30, 2016
Numerator: |  |  |  |
Net income (loss) | $ 1,173 | $ (1,778) | $ (2,001) | $ (11,962)
Weighted average common shares and denominator for basic calculation: |  |  |  |
Weighted average common shares outstanding | 41,131 | 40,501 | 40,960 | 40,242
Less: Unvested restricted stock | 21 | 15 | 21 | 15
Denominator for basic and diluted calculation | 41,110 | 40,486 | 40,939 | 40,227
Effect of dilutive shares: |  |  |  |
Denominator for diluted calculation | 42,104 | 40,486 | 40,939 | 40,227
Net income (loss) per share - basic | $ 0.03 | $ (0.04) | $ (0.05) | $ (0.30)
Net income (loss) per share - diluted | $ 0.03 | $ (0.04) | $ (0.05) | $ (0.30)
Employee Stock Option [Member] |  |  |  |
Effect of dilutive shares: |  |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment | 837 | 0 | 0 | 0
Restricted Stock [Member] |  |  |  |
Effect of dilutive shares: |  |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment | 157 | 0 | 0 | 0

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