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Stockholders' Equity (Tables) | 12 Months Ended
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Jan. 01, 2016
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):
|  | Fiscal Year Ended |
|  | January 1, 2016 |  | January 2, 2015 |  | January 3, 2014 |
Employee stock options |  | $ | 2,306 |  | $ | 2,842 |  | $ | 2,683 |
Restricted stock |  |  | 485 |  |  | 935 |  |  | 999 |
Restricted stock units |  |  | 452 |  |  | 795 |  |  | 589 |
Consultant compensation |  |  | 61 |  |  | 91 |  |  | 218 |
Total |  | $ | 3,304 |  | $ | 4,663 |  | $ | 4,489 |
Schedule of Share-based Compensation, Activity [Table Text Block] | The Company recorded stock-based compensation expense in the following categories on the accompanying consolidated statements of operations (in thousands):
|  | Fiscal Year Ended |
|  | January 1, 2016 |  | January 2, 2015 |  | January 3, 2014 |
Cost of Sales |  | $ | 52 |  | $ | 108 |  | $ | 77 |
General and administrative |  |  | 2,090 |  |  | 2,552 |  |  | 2,586 |
Marketing and selling |  |  | 696 |  |  | 1,065 |  |  | 1,167 |
Research and development |  |  | 466 |  |  | 938 |  |  | 659 |
Total stock-based compensation expense |  |  | 3,304 |  |  | 4,663 |  |  | 4,489 |
Amounts capitalized as part of inventory |  |  | 516 |  |  | 306 |  |  | 232 |
Total stock-based compensation |  | $ | 3,820 |  | $ | 4,969 |  | $ | 4,721 |
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.
|  | Fiscal Year Ended |
|  | January 1, 2016 |  | January 2, 2015 |  | January 3, 2014 |
Expected dividend yield |  |  | 0 | % |  | 0 | % |  | 0 | %
Expected volatility |  |  | 57 | % |  | 55 | % |  | 71 | %
Risk-free interest rate |  |  | 1.59 | % |  | 1.29 | % |  | 0.73 | %
Expected term (in years) |  |  | 5.57 |  |  | 4.12 |  |  | 4.12 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of option activity under the Plan for the year ended January 1, 2016 is presented below:
Options |  | Shares (000’s) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (000’s) |
Outstanding at January 2, 2015 |  |  | 3,175 |  | $ | 7.79 |  |  |  |  |  |  |
Granted |  |  | 1,155 |  |  | 7.81 |  |  |  |  |  |  |
Exercised |  |  | (476) |  |  | 4.56 |  |  |  |  |  |  |
Forfeited or expired |  |  | (231) |  |  | 10.57 |  |  |  |  |  |  |
Outstanding at January 1, 2016 |  |  | 3,623 |  | $ | 8.02 |  |  | 6.59 |  | $ | 3,562 |
Exercisable at January 1, 2016 |  |  | 2,075 |  | $ | 7.15 |  |  | 4.85 |  | $ | 3,352 |
Share-based Compensation, Performance Shares Award Unvested Activity [Table Text Block] | A summary of unvested options activity under the Plan for the year ended January 1, 2016 is presented below:
Options |  | Shares (000’s) |  | Weighted- Average Grant-Date Fair Value |
Unvested at January 2, 2015 |  |  | 1,090 |  | $ | 5.92 |
Granted during the year |  |  | 1,155 |  |  | 4.14 |
Forfeited or expired during the year |  |  | (135) |  |  | 4.69 |
Vested during the year |  |  | (562) |  |  | 5.29 |
Unvested at January 1, 2016 (see Note 18) |  |  | 1,548 |  | $ | 4.34 |
Restricted Stock [Member] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted stock activity for the year ended January 1, 2016 is presented below:
|  | Shares (000’s) |  | Weighted Average Grant-Date Fair Value per Share |
Outstanding at January 2, 2015 |  |  | 247 |  | $ | 9.41 |
Granted |  |  | 34 |  |  | 8.62 |
Vested |  |  | (142) |  |  | 11.88 |
Forfeited or expired |  |  | (15) |  |  | 6.26 |
Outstanding at January 1, 2016 (see Note 18) |  |  | 124 |  | $ | 6.97 |
Restricted Stock Units (RSUs) [Member] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted stock units’ activity for the year ended January 1, 2016 is presented below:
|  | Units (000’s) |  | Weighted Average Grant-Date Fair Value per Share |
Outstanding at January 2, 2015 |  |  | 156 |  | $ | 15.14 |
Granted |  |  | 230 |  |  | 7.60 |
Vested |  |  | (16) |  |  | 9.20 |
Forfeited or expired |  |  | (31) |  |  | 15.20 |
Outstanding at January 1, 2016 (see Note 18) |  |  | 339 |  | $ | 10.44 |

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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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