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Basic and Diluted Net Income (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 29, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands except per share amounts):
|  | Three Months Ended |  | Nine Months Ended |
|  | September 29, |  | September 30, |  | September 29, |  | September 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 1,173 |  | $ | (1,778) |  | $ | (2,001) |  | $ | (11,962) |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |
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: |  |  |  |  |  |  |  |  |  |  |  |  |
Options |  |  | 837 |  |  | — |  |  | — |  |  | — |
Restricted stock and units |  |  | 157 |  |  | — |  |  | — |  |  | — |
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) |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following table sets forth the weighted average number of options to purchase shares of common stock and restricted stock and units, which were not included in the calculation of diluted per share amounts because the effects would be anti-dilutive (in thousands).
|  | Three Months Ended |  | Nine Months Ended |
|  | September 29, | September 30, |  | September 29, |  | September 30, |
|  | 2017 | 2016 |  | 2017 |  | 2016 |
Options |  |  | 1,545 |  |  | 2,134 |  |  | 2,497 |  |  | 2,937 |
Restricted stock and units |  |  | — |  |  | 60 |  |  | 159 |  |  | 48 |
Total |  |  | 1,545 |  |  | 2,194 |  |  | 2,656 |  |  | 2,985 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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