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Stock Based Compensation (Tables) | 3 Months Ended
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Mar. 29, 2014
Activity in Stock Option Plan | The following table summarizes information regarding activity in our stock option plan during the three months ended March 29, 2014:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value (thousands) |
Outstanding at December 28, 2013 |  | 1,102,842 |  |  | $ | 3.97 |  |  |  |  |
Granted |  | 98,000 |  |  | $ | 8.66 |  |  |  |  |
Exercised |  | (84,303 | ) |  | $ | 3.90 |  |  |  |  |
Canceled or forfeited |  | (2,208 | ) |  | $ | 4.26 |  |  |  |  |
Outstanding at March 29, 2014 |  | 1,114,331 |  |  | $ | 4.39 |  |  | $ | 4,697 |
Weighted Average Assumptions for Fair Value Estimate of Stock-Based Awards (Options) | The Company uses the Black-Scholes option-pricing model to estimate fair value of stock-based awards (options) with the following weighted average assumptions:
|  | Three Months Ended |
|  | March 29, 2014 |  |  | March 30, 2013 |
Average risk free interest rate |  |  | 1.49 | % |  |  | 0.59 | %
Expected life (in years) |  |  | 4.5 years |  |  |  | 4.5 years |
Dividend yield |  |  | — | % |  |  | — | %
Average volatility |  |  | 57 | % |  |  | 86 | %
Stock-Based Compensation Expense | The following table shows stock-based compensation expense included in the condensed consolidated statements of operations for the three months ended March 29, 2014 and March 30, 2013:
|  | Three Months Ended |
(in thousands) |  | March 29, 2014 |  |  | March 30, 2013 |
Cost of revenues |  | $ | 34 |  |  | $ | 22 |
Research and development |  |  | 22 |  |  |  | 20 |
Sales and marketing |  |  | 32 |  |  |  | 22 |
General and administrative |  |  | 156 |  |  |  | 97 |
|  | $ | 244 |  |  | $ | 161 |
Stock Options Outstanding, Exercisable and Expected to Vest | Information regarding stock options outstanding, vested and expected to vest and exercisable at March 29, 2014 is summarized below:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value (thousands) |
Options outstanding |  |  | 1,114,331 |  |  | $ | 4.39 |  |  |  | 3.78 |  |  | $ | 4,697 |
Options vested and expected to vest |  |  | 1,038,459 |  |  | $ | 4.29 |  |  |  | 3.61 |  |  | $ | 4,478 |
Options exercisable |  |  | 659,237 |  |  | $ | 3.71 |  |  |  | 2.36 |  |  | $ | 3,218 |
Restricted Stock Units Activity | Information regarding the restricted stock units activity for the three months ended March 29, 2014 is summarized below:
| Number of Shares |
Outstanding at December 28, 2013 |  | 269,259 |
Restricted stock units granted |  | 50,000 |
Restricted stock units released |  | (35,000 | )
Outstanding at March 29, 2014 |  | 284,259 |

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