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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 29, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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 |
|  | September 29, |  | September 30, |  | September 29, |  | September 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Employee stock options |  | $ | 443 |  | $ | 208 |  | $ | 1,204 |  | $ | 5,257 |
Restricted stock |  |  | 50 |  |  | 32 |  |  | 136 |  |  | 259 |
Restricted stock units |  |  | 314 |  |  | 146 |  |  | 845 |  |  | 2,569 |
Nonemployee stock options |  |  | — |  |  | — |  |  | — |  |  | 58 |
Total |  | $ | 807 |  | $ | 386 |  | $ | 2,185 |  | $ | 8,143 |
Schedule Of Share-Based Compensation, Stock Options, Activity [Table Text Block] | The Company recorded stock-based compensation costs in the following categories on the accompanying condensed consolidated statements of operations (in thousands):
|  | Three Months Ended |  | Nine Months Ended |
|  | September 29, |  | September 30, |  | September 29, |  | September 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Cost of sales |  | $ | 2 |  | $ | — |  | $ | 6 |  | $ | 560 |
General and administrative |  |  | 377 |  |  | 248 |  |  | 1,035 |  |  | 3,936 |
Marketing and selling |  |  | 214 |  |  | 72 |  |  | 558 |  |  | 1,544 |
Research and development |  |  | 214 |  |  | 66 |  |  | 586 |  |  | 2,103 |
Total stock compensation expense |  |  | 807 |  |  | 386 |  |  | 2,185 |  |  | 8,143 |
Amounts capitalized as part of inventory |  |  | 107 |  |  | 39 |  |  | 269 |  |  | 227 |
Total |  | $ | 914 |  | $ | 425 |  | $ | 2,454 |  | $ | 8,370 |
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 |
|  | September 29, |  | September 30, |  | September 29, |  | September 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Expected dividend yield |  |  | 0 | % |  | 0 | % |  | 0 | % |  | 0 | %
Expected volatility |  |  | 57 | % |  | 57 | % |  | 57 | % |  | 57 | %
Risk-free interest rate |  |  | 1.83 | % |  | 1.19 | % |  | 1.95 | % |  | 1.34 | %
Expected term (in years) |  |  | 5.67 |  |  | 5.57 |  |  | 5.67 |  |  | 5.57 |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | A summary of option activity under the Plan for the nine-month period ended September 29, 2017 is presented below:
|  | Options |
|  | Shares |
|  | (000’s) |
Outstanding at December 30, 2016 |  |  | 3,502 |
Granted |  |  | 829 |
Exercised |  |  | (334) |
Forfeited or expired |  |  | (170) |
Outstanding at September 29, 2017 |  |  | 3,827 |
Exercisable at September 29, 2017 |  |  | 2,752 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted stock and RSU activity under the Plan for the nine-month period ended September 29, 2017 is presented below:
|  | Restricted |  |  |
|  | Shares |  | RSUs |
|  | (000’s) |  | (000’s) |
Outstanding at December 30, 2016 |  |  | 23 |  |  | 274 |
Granted |  |  | 21 |  |  | 291 |
Vested |  |  | (23) |  |  | (93) |
Forfeited |  |  | — |  |  | (34) |
Outstanding at September 29, 2017 |  |  | 21 |  |  | 438 |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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