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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of impact on results of operations of recording stock-based compensation expense | The impact on the Company’s results of operations of recording stock-based compensation expense for fiscal years 2018, 2017, and 2016 was as follows (in thousands):
|  | Fiscal Years |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Cost of revenue |  | $ | 129 |  |  | $ | 121 |  |  | $ | 132 |
Research and development |  |  | 760 |  |  |  | 614 |  |  |  | 658 |
Selling, general and administrative |  |  | 1,012 |  |  |  | 706 |  |  |  | 794 |
Total costs and expenses |  | $ | 1,901 |  |  | $ | 1,441 |  |  | $ | 1,584 |
Schedule of shares available for grant | The following table summarizes the shares available for grant under the 2009 Plan:
|  | Shares Available for Grant |
|  | (in thousands) |
Balance at December 31, 2017 |  |  | 3,899 |
Authorized |  |  | 4,000 |
Options granted |  |  | — |
Options forfeited or expired |  |  | 141 |
RSUs granted |  |  | (1,539 | )
RSUs forfeited |  |  | 259 |
Balance at December 30, 2018 |  |  | 6,760 |
Schedule of stock options outstanding and stock option activity and related weighted average exercise price | The following table summarizes stock options outstanding and stock option activity under the 2009 Plan, and the related weighted average exercise price, for 2018, 2017 and 2016:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Term |  |  | Aggregate Intrinsic Value |
|  | (in thousands) |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance outstanding at January 3, 2016 |  |  | 5,266 |  |  | $ | 2.64 |  |  |  | 4.56 |  |  |  |  |
Granted |  |  | 842 |  |  |  | 0.86 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (1,129 | ) |  |  | 2.61 |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Balance outstanding at January 1, 2017 |  |  | 4,979 |  |  |  | 2.35 |  |  |  | 4.06 |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (1,356 | ) |  |  | 3.07 |  |  |  |  |  |  |  |  |
Exercised |  |  | (65 | ) |  |  | 1.31 |  |  |  |  |  |  |  |  |
Balance outstanding at December 31, 2017 |  |  | 3,558 |  |  |  | 2.09 |  |  |  | 4.34 |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (141 | ) |  |  | 1.80 |  |  |  |  |  |  |  |  |
Exercised |  |  | (216 | ) |  |  | 0.90 |  |  |  |  |  |  |  |  |
Balance outstanding at December 30, 2018 |  |  | 3,201 |  |  | $ | 2.18 |  |  |  | 3.70 |  |  | $ | - |
Exercisable at December 30, 2018 |  |  | 2,868 |  |  | $ | 2.33 |  |  |  | 3.24 |  |  | $ | - |
Vested and expected to vest at December 30, 2018 |  |  | 3,153 |  |  | $ | 2.20 |  |  |  | 3.64 |  |  | $ | - |
Schedule of significant price ranges of options outstanding, related weighted average exercise prices and contractual life information | Significant exercise price ranges of options outstanding, related weighted average exercise prices and contractual life information at the end of 2018 were as follows:
|  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Options Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Options Vested and Exercisable |  |  | Weighted Average Exercise Price |
|  |  |  | (in thousands) |  |  | (in years) |  |  |  |  |  |  | (in thousands) |  |  |  |  |
$0.78 |  |  |  | 4 |  |  |  | 0.18 |  |  | $ | 0.78 |  |  |  | 4 |  |  | $ | 0.78 |
$0.86 |  |  |  | 726 |  |  |  | 7.69 |  |  |  | 0.86 |  |  |  | 408 |  |  |  | 0.86 |
$ | 1.32 |  |  |  | 66 |  |  |  | 6.90 |  |  |  | 1.32 |  |  |  | 51 |  |  |  | 1.32 |
$1.63 |  |  |  | 545 |  |  |  | 0.27 |  |  |  | 1.63 |  |  |  | 545 |  |  |  | 1.63 |
$2.17 - $2.65 |  |  |  | 287 |  |  |  | 3.66 |  |  |  | 2.25 |  |  |  | 287 |  |  |  | 2.25 |
$2.78 |  |  |  | 944 |  |  |  | 1.93 |  |  |  | 2.78 |  |  |  | 944 |  |  |  | 2.78 |
$2.82 - $3.36 |  |  |  | 222 |  |  |  | 4.43 |  |  |  | 3.16 |  |  |  | 222 |  |  |  | 3.16 |
$3.39 |  |  |  | 237 |  |  |  | 4.73 |  |  |  | 3.39 |  |  |  | 237 |  |  |  | 3.39 |
$3.48 |  |  |  | 105 |  |  |  | 3.36 |  |  |  | 3.48 |  |  |  | 105 |  |  |  | 3.48 |
$3.82 |  |  |  | 65 |  |  |  | 5.08 |  |  |  | 3.82 |  |  |  | 65 |  |  |  | 3.82 |
$0.78 - $3.82 |  |  |  | 3,201 |  |  |  | 3.70 |  |  | $ | 2.18 |  |  |  | 2,868 |  |  | $ | 2.33 |
Schedule of weighted average assumptions included in estimated fair value calculations for stock option grants | The following weighted average assumptions are included in the estimated fair value calculations for stock option grants:
|  | Fiscal Years |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Expected term (years) |  |  | — |  |  |  | — |  |  |  | 7.1 |
Risk-free interest rate |  |  | — |  |  |  | — |  |  |  | 1.40 | %
Expected volatility |  |  | — |  |  |  | — |  |  |  | 52 | %
Expected dividend |  |  | — |  |  |  | — |  |  |  | — |
Schedule of share-based compensation related to RSU | The following table summarizes RSU’s activity under the 2009 Plan, and the related weighted average grant date fair value, for 2018, 2017 and 2016:
|  | RSUs & PRSUs Outstanding |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
|  | (in thousands) |  |  |  |  |
Nonvested at January 3, 2016 |  |  | 1,435 |  |  | $ | 2.30 |
Granted |  |  | 1,822 |  |  |  | 0.97 |
Vested |  |  | (649 | ) |  |  | 1.07 |
Forfeited |  |  | (1,238 | ) |  |  | — |
Nonvested at January 1, 2017 |  |  | 1,370 |  |  |  | 1.68 |
Granted |  |  | 1,852 |  |  |  | 1.41 |
Vested |  |  | (596 | ) |  |  | 1.46 |
Forfeited |  |  | (263 | ) |  |  | — |
Nonvested at December 31, 2017 |  |  | 2,363 |  |  |  | 1.54 |
Granted |  |  | 1,539 |  |  |  | 0.85 |
Vested |  |  | (1,073 | ) |  |  | 1.37 |
Forfeited |  |  | (259 | ) |  |  | — |
Nonvested at December 30, 2018 |  |  | 2,570 |  |  | $ | 1.23 |
Summary of the fair value of rights issued pursuant to ESPP | The fair value of rights issued pursuant to the Company’s ESPP was estimated on the commencement date of each offering period using the following weighted average assumptions:
|  | Fiscal Years |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Expected life (months) |  | 6.0 |  |  |  | 6.1 |  |  |  | 6.1 |
Risk-free interest rate |  |  | 2.26 | % |  |  | 1.22 | % |  |  | 0.97 | %
Volatility |  |  | 50 | % |  |  | 53 | % |  |  | 59 | %
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |

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