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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 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 2017, 2016, and 2015 was as follows (in thousands):
| Fiscal Years
| 2017 |  | 2016 |  | 2015
Cost of revenue | $ | 121 |  |  | $ | 132 |  |  | $ | 109 |
Research and development | 614 |  |  | 658 |  |  | 826 |
Selling, general and administrative | 706 |  |  | 794 |  |  | 1,064 |
Restructuring costs (1) | — |  |  | — |  |  | 29 |
Total costs and expenses | $ | 1,441 |  |  | $ | 1,584 |  |  | $ | 2,028 |
(1) Stock-based compensation related to restructuring plan initiated in the second quarter of fiscal year 2015.
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 1, 2017 | 2,632 |
Authorized | 1,500 |
Options granted | — |
Options forfeited or expired | 1,356 |
RSUs granted | (1,852 | )
RSUs forfeited | 263 |
Balance at December 31, 2017 | 3,899 |
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 2017, 2016 and 2015:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in years) |  | (in thousands)
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 |  |  | 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 |  | $ | 976 |
Exercisable at December 31, 2017 | 3,001 |  |  | $ | 2.29 |  |  | 3.56 |  | $ | 524 |
Vested and expected to vest at December 31, 2017 | 3,443 |  |  | $ | 2.13 |  |  | 4.20 |  | $ | 879 |
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 2017 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 |  |  | 1.17 |  | $ | 0.78 |  |  | 4 |  |  | $ | 0.78 |
$0.86 | 726 |  |  | 8.68 |  | 0.86 |  |  | 227 |  |  | 0.86 |
$0.90 - $1.32 | 359 |  |  | 2.11 |  | 0.98 |  |  | 327 |  |  | 0.94 |
$1.63 | 545 |  |  | 1.27 |  | 1.63 |  |  | 545 |  |  | 1.63 |
$2.17 - $2.65 | 307 |  |  | 4.42 |  | 2.25 |  |  | 307 |  |  | 2.25 |
$2.78 | 958 |  |  | 2.94 |  | 2.78 |  |  | 958 |  |  | 2.78 |
$2.82 - $3.36 | 231 |  |  | 5.30 |  | 3.15 |  |  | 211 |  |  | 3.15 |
$3.39 | 243 |  |  | 5.95 |  | 3.39 |  |  | 243 |  |  | 3.39 |
$3.48 | 120 |  |  | 3.85 |  | 3.48 |  |  | 120 |  |  | 3.48 |
$3.82 | 65 |  |  | 6.08 |  | 3.82 |  |  | 59 |  |  | 3.82 |
$0.78 - $3.82 | 3,558 |  |  | 4.34 |  | $ | 2.09 |  |  | 3,001 |  |  | $ | 2.29 |
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
| 2017 |  | 2016 |  | 2015
Expected term (years) | NA |  | 7.1 |  |  | 6.3 |
Risk-free interest rate | NA |  | 1.40 | % |  | 1.75 | %
Expected volatility | NA |  | 52 | % |  | 56 | %
Expected dividend | NA |  | — |  |  | — |
Schedule of share-based compensation related to RSU | Stock-based compensation related to grants of vested RSUs was $1.0 million, $953,000, $834,000 in 2017, 2016 and 2015, respectively. The following table summarizes RSU's activity under the 2009 Plan, and the related weighted average grant date fair value, for 2017, 2016 and 2015:
| RSUs & PRSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
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 |
Granted | 1,852 |  |  | 1.41 |
Vested | (596 | ) |  | 1.46 |
Forfeited | (263 | ) |  | — |
Nonvested at December 31, 2017 | 2,363 |  |  | $ | 1.54 |
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
| 2017 |  | 2016 |  | 2015
Expected life (months) | 6.1 |  |  | 6.1 |  |  | 6.0 |
Risk-free interest rate | 1.22 | % |  | 0.97 | % |  | 0.21 | %
Volatility | 53 | % |  | 59 | % |  | 55 | %
Dividend yield | — |  |  | — |  |  | — |

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