Common Stock Options (Tables)
 3 Months Ended
May 04, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Activity Related to Restricted Shares of Common Stock
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
Schedule of Stock Option Activity Under Plan
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
Schedule of Fair Value of Option Award Granted Weighted Average Assumptions
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
—
%
 
—
%