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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Jan. 01, 2017
Disclosure of Compensation Related Costs, Share-based 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 2016, 2015, and 2014 was as follows (in thousands):
| Fiscal Years
| 2016 |  | 2015 |  | 2014
Cost of revenue | $ | 132 |  |  | $ | 109 |  |  | $ | 137 |
Research and development | 658 |  |  | 826 |  |  | 924 |
Selling, general and administrative | 794 |  |  | 1,064 |  |  | 1,181 |
Restructuring costs (1) | — |  |  | 29 |  |  | — |
Total costs and expenses | $ | 1,584 |  |  | $ | 2,028 |  |  | $ | 2,242 |
(1)Stock-based compensation related to restructuring plan initiated in the second quarter of fiscal year 2015. No stock-based compensation was capitalized during any period presented above.
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
| 2016 |  | 2015 |  | 2014
Expected term (years) | 7.1 |  |  | 6.3 |  |  | 6.6 |
Risk-free interest rate | 1.40 | % |  | 1.75 | % |  | 1.98 | %
Expected volatility | 52 | % |  | 56 | % |  | 58 | %
Expected dividend | — |  |  | — |  |  | — |
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 January 3, 2016 | 2,929 |
Authorized | — |
Options granted | (842 | )
Options forfeited or expired | 1,129 |
RSUs granted | (1,629 | )
RSUs forfeited | 789 |
PRSUs granted | (193 | )
PRSU's forfeited or expired | 449 |
Balance at January 1, 2017 | 2,632 |
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 2016, 2015 and 2014:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in years) |  | (in thousands)
Balance outstanding at December 29, 2013 | 7,242 |  |  | $ | 2.62 |  |  |  |  |
Granted | 428 |  |  | 3.51 |  |  |  |  |
Forfeited or expired | (219 | ) |  | 3.56 |  |  |  |  |
Exercised | (1,769 | ) |  | 2.57 |  |  |  |  |
Balance outstanding at December 28, 2014 | 5,682 |  |  | 2.67 |  |  |  |  |
Granted | 225 |  |  | 1.64 |  |  |  |  |
Forfeited or expired | (521 | ) |  | 2.87 |  |  |  |  |
Exercised | (120 | ) |  | 0.98 |  |  |  |  |
Balance outstanding at January 3, 2016 | 5,266 |  |  | 2.64 |  |  |  |  |
Granted | 842 |  |  | 0.86 |  |  |  |  |
Forfeited or expired | (1,129 | ) |  | 2.61 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Balance outstanding at January 1, 2017 | 4,979 |  |  | $ | 2.35 |  |  | 4.06 |  | $ | 586 |
Exercisable at January 1, 2017 | 4,078 |  |  | $ | 2.59 |  |  | 2.90 |  | $ | 199 |
Vested and expected to vest at January 1, 2017 | 4,740 |  |  | $ | 2.41 |  |  | 3.78 |  | $ | 473 |
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 2016 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 - $0.78 | 4 |  |  | 2.17 |  | $ | 0.78 |  |  | 5 |  |  | $ | 0.78 |
0.86 - 0.86 | 726 |  |  | 9.68 |  | 0.86 |  |  | — |  |  | — |
0.90 - 1.32 | 463 |  |  | 2.62 |  | 0.96 |  |  | 414 |  |  | 0.92 |
1.63 - 1.63 | 731 |  |  | 1.92 |  | 1.63 |  |  | 731 |  |  | 1.63 |
2.17 - 2.76 | 446 |  |  | 4.04 |  | 2.29 |  |  | 446 |  |  | 2.29 |
2.78 - 2.78 | 1,299 |  |  | 3.08 |  | 2.78 |  |  | 1,299 |  |  | 2.78 |
2.82 - 3.39 | 635 |  |  | 5.20 |  | 3.29 |  |  | 530 |  |  | 3.28 |
3.48 - 3.82 | 185 |  |  | 5.63 |  | 3.60 |  |  | 164 |  |  | 3.57 |
3.92 - 3.92 | 2 |  |  | 4.28 |  | 3.92 |  |  | 1 |  |  | 3.92 |
4.17 - 4.17 | 488 |  |  | 0.79 |  | 4.17 |  |  | 488 |  |  | 4.17 |
$0.78 - $4.17 | 4,979 |  |  | 4.06 |  | $ | 2.35 |  |  | 4,078 |  |  | $ | 2.59 |
Schedule of share-based compensation related to RSU | The stock-based compensation related to grants of vested RSUs was $953,000, $834,000, $854,000 in 2016, 2015 and 2014, respectively. In 2016, the Company cancelled PSU's issued to certain officers, which resulted in a credit of $113,000 to the stock-based compensation.
| RSUs & PRSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
Nonvested at December 29, 2013 | 225 |  |  | $ | 3.17 |
Granted | 947 |  |  | 3.74 |
Vested | (480 | ) |  | 3.86 |
Forfeited | (42 | ) |  | — |
Nonvested at December 28, 2014 | 650 |  |  | 3.47 |
Granted | 1,128 |  |  | 1.46 |
Vested | (221 | ) |  | 1.42 |
Forfeited | (122 | ) |  | — |
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 |
Schedule of weighted average assumptions | 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
| 2016 |  | 2015 |  | 2014
Expected life (months) | 6.1 |  |  | 6.0 |  |  | 6.0 |
Risk-free interest rate | 0.97 | % |  | 0.21 | % |  | 0.07 | %
Volatility | 59.3 | % |  | 55 | % |  | 49 | %
Dividend yield | — |  |  | — |  |  | — |

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