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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 28, 2014
Summary of Activity in Stock Option Plan | The following table summarizes information regarding activity in our stock option plan during the six months ended June 28, 2014:
| Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value (thousands) |
Outstanding as of December 28, 2013 |  | 1,102,842 |  |  | $ | 3.97 |  |  |  |  |
Granted |  | 127,500 |  |  | $ | 8.72 |  |  |  |  |
Exercised |  | (209,610 | ) |  | $ | 4.05 |  |  |  |  |
Canceled or forfeited |  | (25,696 | ) |  | $ | 6.28 |  |  |  |  |
Outstanding as of June 28, 2014 |  | 995,036 |  |  | $ | 4.50 |  |  | $ | 3,821 |
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 |  |  | Six Months Ended |
| June 28, 2014 |  |  | June 29, 2013 |  |  | June 28, 20143 |  |  | June 29, 2013 |
Average risk free interest rate |  | 1.45 | % |  |  | 1.31 | % |  |  | 1.48 | % |  |  | 0.83 | %
Expected life (in years) |  | 4.5 years |  |  |  | 4.5 years |  |  |  | 4.5 years |  |  |  | 4.5 years |
Dividend yield |  | — | % |  |  | — | % |  |  | — | % |  |  | — | %
Average volatility |  | 55 | % |  |  | 79 | % |  |  | 57 | % |  |  | 84 | %
Stock-Based Compensation Expense | The following table shows stock-based compensation expense included in the condensed consolidated statements of operations for the three and six months ended June 28, 2014 and June 29, 2013:
| Three Months Ended |  |  | Six Months Ended |
| June 28, 2014 |  |  | June 29, 2013 |  |  | June 28, 2014 |  |  | June 29, 2013 |
Cost of revenues | $ | 39 |  |  | $ | 29 |  |  | $ | 73 |  |  | $ | 51 |
Research and development |  | 26 |  |  |  | 16 |  |  |  | 48 |  |  |  | 36 |
Sales and marketing |  | 28 |  |  |  | 28 |  |  |  | 60 |  |  |  | 50 |
General and administrative |  | 141 |  |  |  | 100 |  |  |  | 297 |  |  |  | 197 |
| $ | 234 |  |  | $ | 173 |  |  | $ | 478 |  |  | $ | 334 |
Summary of Stock Options Outstanding, Vested and Expected to Vest and Exercisable | Information regarding stock options outstanding, vested and expected to vest and exercisable as of June 28, 2014 is summarized below:
| Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value (thousands) |
Options outstanding |  | 995,036 |  |  | $ | 4.50 |  |  |  | 4.03 |  |  | $ | 3,821 |
Options vested and expected to vest |  | 926,071 |  |  | $ | 4.38 |  |  |  | 3.88 |  |  | $ | 3,662 |
Options exercisable |  | 564,581 |  |  | $ | 3.58 |  |  |  | 2.69 |  |  | $ | 2,655 |
Restricted Stock Units Activity | Information regarding the restricted stock units activity for the six months ended June 28, 2014 is summarized below:
| Number of Shares |
Outstanding as of December 28, 2013 |  | 269,259 |
Restricted stock units granted |  | 50,000 |
Restricted stock units released |  | (36,250 | )
Outstanding as of June 28, 2014 |  | 283,009 |

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