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Stock-Based Compensation (Tables) | 9 Months Ended
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Oct. 03, 2014
Stockholders' Equity Note [Abstract] |
Schedule Of Compensation Cost [Table Text Block] | The cost that has been charged against income for stock-based compensation is set forth below (in thousands):
|  | Three Months Ended |  | Nine Months Ended |
|  | October 3, 2014 |  | September 27, 2013 |  | October 3, 2014 |  | September 27, 2013 |
Employee stock options |  | $ | 666 |  | $ | 576 |  | $ | 2,138 |  | $ | 2,068 |
Restricted stock |  |  | 141 |  |  | 283 |  |  | 666 |  |  | 718 |
Restricted stock units |  |  | 705 |  |  | — |  |  | 1,857 |  |  | — |
Nonemployee stock options |  |  | 41 |  |  | 47 |  |  | 75 |  |  | 138 |
Total |  | $ | 1,553 |  | $ | 906 |  | $ | 4,736 |  | $ | 2,924 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] | The Company recorded stock-based compensation expense in the following categories on the accompanying condensed consolidated statements of operations (in thousands):
|  | Three Months Ended |  | Nine Months Ended |
|  | October 3, 2014 |  | September 27, 2013 |  | October 3, 2014 |  | September 27, 2013 |
General and administrative |  | $ | 869 |  | $ | 506 |  | $ | 2,925 |  | $ | 1,912 |
Marketing and selling |  |  | 326 |  |  | 211 |  |  | 906 |  |  | 593 |
Research and development |  |  | 358 |  |  | 189 |  |  | 905 |  |  | 419 |
Total |  | $ | 1,553 |  | $ | 906 |  | $ | 4,736 |  | $ | 2,924 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The risk-free rate is based on the U.S. Treasury yield curve corresponding to the expected term at the time of the grant.
|  | Three Months Ended |  |  | Nine Months Ended |
|  | October 3, 2014 |  |  | September 27, 2013 |  |  | October 3, 2014 |  |  | September 27, 2013 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 56.24 | % |  |  | 58.43 | % |  |  | 55.47 | % |  |  | 71.69 | %
Risk-free interest rate |  |  | 1.36 | % |  |  | 1.32 | % |  |  | 1.29 | % |  |  | 0.69 | %
Expected term (in years) |  |  | 4.12 |  |  |  | 4.12 |  |  |  | 4.12 |  |  |  | 4.12 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of option activity under the Plan as of October 3, 2014 is presented below:
|  | Options Shares (000’s) |
Outstanding as of January 3, 2014 |  |  | 3,299 |
Granted |  |  | 614 |
Exercised |  |  | (593) |
Forfeited or expired |  |  | (93) |
Outstanding as of October 3, 2014 |  |  | 3,227 |
Exercisable as of October 3, 2014 |  |  | 2,098 |
A summary of restricted stock and restricted stock units activity under the Plan for the period ending October 3, 2014 is presented below:
|  | Restricted Shares (000’s) |  | Restricted Units (000’s) |
Outstanding as of January 3, 2014 |  |  | 341 |  |  | 135 |
Granted |  |  | 65 |  |  | 304 |
Vested |  |  | (140) |  |  | (135) |
Forfeited or expired |  |  | (19) |  |  | (15) |
Outstanding as of October 3, 2014 |  |  | 247 |  |  | 289 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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