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Stockholders' Equity and Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 28, 2014
Summary of Assumptions Used for Fair Value of Options | The fair value of the surrendered stock options and the new stock options was estimated on the date of the exchange using the Black-Scholes option pricing model with the following assumptions:
|  | Surrendered Stock Options |  |  | New Stock Options |
Expected life |  |  | 1.93 – 6.87 years |  |  |  | 5.84 years |
Risk-free interest rate |  |  | 0.5% – 2.4% |  |  |  | 2.0% |
Expected volatility |  |  | 55% – 73% |  |  |  | 72% |
Expected dividend yield |  |  | 0% |  |  |  | 0% |
Summary of Share-based Compensation from Options, Warrants and Stock Awards | Share-based compensation from options, warrants and stock awards, is included in our consolidated statements of comprehensive operations, as follows (in thousands):
|  | Thirteen Weeks Ended |  |  | Twenty-Six Weeks Ended |
|  | June 28, 2014 |  |  | June 29, 2013 |  |  | June 28, 2014 |  |  | June 29, 2013 |
Marketing expense |  | $ | 136 |  |  | $ | 69 |  |  | $ | 217 |  |  | $ | 153 |
General and administrative expense |  |  | 390 |  |  |  | 220 |  |  |  | 628 |  |  |  | 502 |
Fulfillment expense |  |  | 60 |  |  |  | 25 |  |  |  | 98 |  |  |  | 56 |
Technology expense |  |  | 43 |  |  |  | 27 |  |  |  | 62 |  |  |  | 39 |
Total share-based compensation expense |  | $ | 629 |  |  | $ | 341 |  |  | $ | 1,005 |  |  | $ | 750 |
Surrendered Stock Options and New Stock Options [Member] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity for the twenty-six weeks ended June 28, 2014, and details regarding the options outstanding and exercisable at June 28, 2014:
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (1) |
Options outstanding, December 28, 2013 |  |  | 5,320 |  |  | $ | 2.97 |  |  |  |  |  |  |  |  |
Granted |  |  | 815 |  |  | $ | 2.29 |  |  |  |  |  |  |  |  |
Exercised |  |  | (109 | ) |  | $ | 2.00 |  |  |  |  |  |  |  |  |
Expired |  |  | (92 | ) |  | $ | 4.68 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (98 | ) |  | $ | 1.72 |  |  |  |  |  |  |  |  |
Options outstanding, June 28, 2014 |  |  | 5,836 |  |  | $ | 2.88 |  |  |  | 6.79 |  |  | $ | 7,681 |
Vested and expected to vest at June 28, 2014 |  |  | 4,991 |  |  | $ | 3.06 |  |  |  | 6.35 |  |  | $ | 6,121 |
Options exercisable, June 28, 2014 |  |  | 3,050 |  |  | $ | 3.79 |  |  |  | 4.50 |  |  | $ | 2,642 |
(1) | These amounts represent the difference between the exercise price and the closing price of U.S. Auto Parts Network, Inc. stock on June 28, 2014 as reported on the NASDAQ National Market, for all options outstanding that have an exercise price currently below the closing price.
Summary of Assumptions Used for Fair Value of Options | The fair value of each option grant was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions for each of the periods ended:
|  | Thirteen Weeks Ended |  | Twenty-Six Weeks Ended
|  | June 28, 2014 |  | June 29, 2013 |  | June 28, 2014 |  | June 29, 2013
Expected life |  | 5.37 years |  | 5.73 years |  | 5.30 – 5.37 years |  | 5.73 years
Risk-free interest rate |  | 1.5% – 1.8% |  | 1.7% |  | 1.5% – 1.8% |  | 1.0% – 1.7%
Expected volatility |  | 65% |  | 73% |  | 65% – 68% |  | 72% – 73%
Expected dividend yield |  | 0% |  | 0% |  | 0% |  | 0%

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