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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 29, 2017
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 29, 2017:
|  | Fair Value |
Stock Options |  | $ | 4,985 |
Restricted Stock Units |  |  | 3,586 |
Restricted Stock |  |  | 200 |
Total |  | $ | 8,771 |
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 29, 2017 |  | December 30, 2016 |  | January 1, 2016 |
Employee stock options |  | $ | 1,731 |  | $ | 5,485 |  | $ | 2,306 |
Restricted stock |  |  | 186 |  |  | 298 |  |  | 485 |
Restricted stock units |  |  | 1,226 |  |  | 2,717 |  |  | 452 |
Consultant compensation |  |  | 18 |  |  | 58 |  |  | 61 |
Total |  | $ | 3,161 |  | $ | 8,558 |  | $ | 3,304 |
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 consolidated statements of operations (in thousands):
|  | Fiscal Year Ended |
|  | December 29, 2017 |  | December 30, 2016 |  | January 1, 2016 |
Cost of Sales |  | $ | 8 |  | $ | 612 |  | $ | 52 |
General and administrative |  |  | 1,487 |  |  | 3,809 |  |  | 2,090 |
Marketing and selling |  |  | 805 |  |  | 1,961 |  |  | 696 |
Research and development |  |  | 861 |  |  | 2,176 |  |  | 466 |
Total stock-based compensation expense |  |  | 3,161 |  |  | 8,558 |  |  | 3,304 |
Amounts capitalized as part of inventory |  |  | 372 |  |  | 269 |  |  | 516 |
Total stock-based compensation |  | $ | 3,533 |  | $ | 8,827 |  | $ | 3,820 |
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 29, |  |  | December 30, |  |  | January 1, |
2017 | 2016 | 2016
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 57 | % |  |  | 57 | % |  |  | 57 | %
Risk-free interest rate |  |  | 1.96 | % |  |  | 1.34 | % |  |  | 1.59 | %
Expected term (in years) |  |  | 5.67 |  |  |  | 5.57 |  |  |  | 5.57 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of option activity under the Plan for the year ended December 29, 2017 is presented below:
Options |  | Shares (000’s) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (000’s) |
Outstanding at December 30, 2016 |  |  | 3,502 |  | $ | 8.28 |  |  |  |  |  |  |  |
Granted |  |  | 956 |  |  | 10.19 |  |  |  |  |  |  |  |
Exercised |  |  | (557) |  |  | 7.12 |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (176) |  |  | 11.62 |  |  |  |  |  |  |  |
Outstanding at December 29, 2017 |  |  | 3,725 |  | $ | 8.78 |  |  |  | 6.96 |  | $ | 25,069 |
Exercisable at December 29, 2017 |  |  | 2,577 |  | $ | 8.38 |  |  |  | 6.00 |  | $ | 18,395 |
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 29, 2017 is presented below:
|  |  |  |  | Weighted- |
|  | Average
| Shares | Grant-Date
Options | (000’s) | Fair Value
Unvested at December 30, 2016 |  |  | 662 |  |  | $ | 3.84 |
Granted during the year |  |  | 956 |  |  |  | 5.42 |
Forfeited or expired during the year |  |  | (176) |  |  |  | 5.53 |
Vested during the year |  |  | (294) |  |  |  | 5.14 |
Unvested at December 29, 2017 |  |  | 1,148 |  |  | $ | 4.96 |
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 29, 2017 is presented below:
|  |  |  | Weighted |
|  |  |  | Average |
|  |  |  | Grant-Date |
|  | Shares |  | Fair Value |
Restricted Stock |  | (000’s) |  | per Share |
Outstanding at December 30, 2016 |  |  | 23 |  | $ | 6.47 |
Granted |  |  | 21 |  |  | 9.60 |
Vested |  |  | (23) |  |  | 6.47 |
Outstanding at December 29. 2017 |  |  | 21 |  | $ | 9.60 |
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 29, 2017 is presented below:
|  | Units (000’s) |  | Weighted Average Grant-Date Fair Value per Share |
Outstanding at December 30, 2016 |  |  | 274 |  | $ | 7.60 |
Granted |  |  | 345 |  |  | 10.39 |
Vested |  |  | (96) |  |  | 7.76 |
Forfeited or expired |  |  | (35) |  |  | 8.81 |
Outstanding at December 29, 2017 |  |  | 488 |  | $ | 9.45 |

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