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Common Stock Options | 3 Months Ended
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May 04, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Common Stock Options | Common Stock Options Effective July 26, 2002, the Company adopted the 2002 Equity Incentive Plan (the “Plan”) pursuant to which the Company’s board of directors may grant stock options and restricted shares to officers, directors, key employees, and professional service providers. The Plan, as amended as of July 24, 2012, allows for the issuance of up to a total of 7,600,000 shares under the Plan. All stock options have a term not greater than 10 years. Stock options vest and become exercisable in whole or in part, in accordance with vesting conditions set by the Company’s board of directors. Options granted to date generally vest over four years from the date of grant. As of May 4, 2013, 4,873,709 stock options or restricted shares were available for grant. On August 25, 2010, the Company’s board of directors agreed to allow option holders, as of that date, to exercise, during a twenty day offer period, all options issued and outstanding under the Plan, regardless if those options were vested and exercisable (“Vested Options”) or were not currently vested and exercisable (“Unvested Options”). On October 13, 2010, the holders of the stock options exercised all of their outstanding Vested Options and Unvested Options to purchase shares of the Company’s common stock. The Unvested Options were exercised for restricted shares of common stock that have the same vesting schedule as the Unvested Options that were exercised for those shares. The restricted shares are subject to repurchase by the Company should the option holder’s employment be terminated prior to the vesting at a purchase price equal to the lesser of: (i) the exercise price paid for the restricted shares, and (ii) the fair market value of the restricted shares at the time of repurchase. For accounting purposes, as the shares remain subject to their original vesting provisions, the early exercises are being recorded as if the original options remain outstanding until the respective shares vest. Exercise proceeds received prior to the shares vesting are recorded as a deposit liability in other accrued expenses on the balance sheets. As of May 4, 2013, $0.2 million was recorded as a deposit liability. The following table summarizes the activity related to the restricted shares of common stock (in thousands):
| Number of shares |  | Deposit liability
Unvested, February 2, 2013 | 31,542 |  |  | $ | 308 |
Vested | (11,137 | ) |  | (80 | )
Unvested, May 4, 2013 | 20,405 |  |  | $ | 228 |
Stock option activity under the Plan was as follows:
| Options outstanding |  | Weighted average exercise price |  | Weighted average remaining contractual term
Balance at February 2, 2013 | 1,187,817 |  |  | $ | 10.43 |  |  | 9.3
Granted | 122,250 |  |  | 37.22 |  |  |
Forfeited | (4,843 | ) |  | 4.95 |  |  |
Exercised | (36,781 | ) |  | 4.28 |  |  |
Balance at May 4, 2013 | 1,268,443 |  |  | $ | 13.21 |  |  | 8.9
Exercisable at May 4, 2013 | 56,158 |  |  | $ | 10.73 |  |  | 7.2
Included in the options outstanding as of May 4, 2013 are options to purchase shares of common stock by non-employees. The Company accounts for stock-based compensation for non-employee stock options by using the Black-Scholes option-pricing model and records expense as the options vest. Non-employee options subject to vesting are required to be periodically revalued over their service period, which is generally the same as the vesting period. The fair value of each option award granted to employees, including outside directors, is estimated on the date of grant and the fair value of each option award granted to non-employees is estimated on the date of grant and is required to be periodically revalued over the contractual period until the option award is exercised or forfeited using the Black-Scholes option-pricing model with the following weighted average assumptions:
| Thirteen Weeks Ended
May 4, 2013 |  | April 28, 2012
Expected volatility | 50.0 | % |  | 50.0 | %
Risk-free interest rate | 1.1 | % |  | 1.5 | %
Expected life of options - for employee grants | 6.3 years |  |  | 7.0 years |
Expected dividend yield | — | % |  | — | %
The Company uses the simplified method to estimate the expected term of the option. The expected volatility incorporates historical and implied volatility of similar entities whose share price are publicly available. The risk-free rate for the expected term of the option was based on the U.S. Treasury yield curve in effect at the time of grant. The per-share weighted average grant-date fair value of stock options granted to employees, including outside directors, for the thirteen weeks ended May 4, 2013 and April 28, 2012 was $18.15 and $4.36, respectively. As of May 4, 2013, there was $13.3 million of total unrecognized compensation costs related to non-vested share-based compensation arrangements granted under the Plan, excluding options that vest upon the achievement of performance targets. That cost is expected to be recognized over a weighted average vesting period of 2.0 years.

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