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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 30, 2016
Schedule of Share-based Compensation, Fair Value of Stock Compensation Granted [Table Text Block] | The following table represents the fair value of stock compensation granted during the year ended December 30, 2016:
|  | Fair Value |
Stock Options |  | $ | 2,946 |
Restricted Stock Units |  |  | 2,396 |
Restricted Stock |  |  | 150 |
|  | $ | 5,492 |
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 |
|  | December 30, |  | January 1, |  | January 2, |
|  | 2016 |  | 2016 |  | 2015 |
Employee stock options |  | $ | 5,485 |  | $ | 2,306 |  | $ | 2,842 |
Restricted stock |  |  | 298 |  |  | 485 |  |  | 935 |
Restricted stock units |  |  | 2,717 |  |  | 452 |  |  | 795 |
Consultant compensation |  |  | 58 |  |  | 61 |  |  | 91 |
Total |  | $ | 8,558 |  | $ | 3,304 |  | $ | 4,663 |
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 |
|  | December 30, |  | January 1, |  | January 2, |
|  | 2016 |  | 2016 |  | 2015 |
Cost of Sales |  | $ | 612 |  | $ | 52 |  | $ | 108 |
General and administrative |  |  | 3,809 |  |  | 2,090 |  |  | 2,552 |
Marketing and selling |  |  | 1,961 |  |  | 696 |  |  | 1,065 |
Research and development |  |  | 2,176 |  |  | 466 |  |  | 938 |
Total stock-based compensation expense |  |  | 8,558 |  |  | 3,304 |  |  | 4,663 |
Amounts capitalized as part of inventory |  |  | 269 |  |  | 516 |  |  | 306 |
Total stock-based compensation |  | $ | 8,827 |  | $ | 3,820 |  | $ | 4,969 |
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 |
|  | December 30, |  |  | January 1, |  |  | January 2, |
|  | 2016 |  |  | 2016 |  |  | 2015 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 57 | % |  |  | 57 | % |  |  | 55 | %
Risk-free interest rate |  |  | 1.34 | % |  |  | 1.59 | % |  |  | 1.29 | %
Expected term (in years) |  |  | 5.57 |  |  |  | 5.57 |  |  |  | 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 December 30, 2016 is presented below:
|  |  |  |  |  | Weighted- |  |  |
|  |  |  | Weighted- |  | Average |  | Aggregate |
|  |  |  | Average |  | Remaining |  | Intrinsic |
|  | Shares |  | Exercise |  | Contractual |  | Value |
Options |  | (000’s) |  | Price |  | Term (years) |  | (000’s) |
Outstanding at January 1, 2016 |  |  | 3,623 |  | $ | 8.02 |  |  |  |  |  |  |
Granted |  |  | 781 |  |  | 7.32 |  |  |  |  |  |  |
Exercised |  |  | (541) |  |  | 4.51 |  |  |  |  |  |  |
Forfeited or expired |  |  | (361) |  |  | 9.23 |  |  |  |  |  |  |
Outstanding at December 30, 2016 |  |  | 3,502 |  | $ | 8.28 |  |  | 6.75 |  | $ | 11,010 |
Exercisable at December 30, 2016 |  |  | 2,840 |  | $ | 8.47 |  |  | 6.16 |  | $ | 8,765 |
Share-based Compensation, Performance Shares Award Unvested Activity [Table Text Block] | A summary of unvested options activity under the Plan for the year ended December 30, 2016 is presented below:
|  |  |  | Weighted- |
|  |  |  | Average |
|  | Shares |  | Grant-Date |
Options |  | (000’s) |  | Fair Value |
Unvested at January 1, 2016 |  |  | 1,548 |  | $ | 4.34 |
Granted during the year |  |  | 781 |  |  | 3.77 |
Forfeited or expired during the year |  |  | (361) |  |  | 5.10 |
Vested during the year |  |  | (1,306) |  |  | 5.37 |
Unvested at December 30, 2016 |  |  | 662 |  | $ | 3.84 |
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 December 30, 2016 is presented below:
|  |  |  | Weighted |
|  |  |  | Average |
|  |  |  | Grant-Date |
|  | Shares |  | Fair Value |
|  | (000’s) |  | per Share |
Outstanding at January 1, 2016 |  |  | 124 |  | $ | 6.97 |
Granted |  |  | 23 |  |  | 6.47 |
Vested |  |  | (124) |  |  | 6.97 |
Outstanding at December 30, 2016 |  |  | 23 |  | $ | 6.47 |
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 December 30, 2016 is presented below:
|  |  |  | Weighted |
|  |  |  | Average |
|  |  |  | Grant-Date |
|  | Units |  | Fair Value |
|  | (000’s) |  | per Share |
Outstanding at January 1, 2016 |  |  | 339 |  | $ | 10.44 |
Granted |  |  | 323 |  |  | 7.43 |
Vested |  |  | (380) |  |  | 9.90 |
Forfeited or expired |  |  | (8) |  |  | 12.48 |
Outstanding at December 30, 2016 |  |  | 274 |  | $ | 7.60 |

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