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Stockholders' Equity
 6 Months Ended
Aug. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stockholders' Equity
Stockholders’ Equity
Stock-Based Compensation
Total stock-based compensation expense has been classified as follows in our condensed consolidated statements of income (in thousands):
 
Three Months Ended August 31,
 
Six Months Ended August 31,
 
2017
 
2016
 
2017
 
2016
Cost of revenue
$
496

 
$
338

 
$
922

 
$
636

Research and development
3,121

 
2,608

 
5,808

 
5,072

Sales and marketing
3,400

 
1,943

 
5,534

 
3,791

General and administrative
2,611

 
3,007

 
4,747

 
6,334

 
$
9,628

 
$
7,896

 
$
17,011

 
$
15,833


As of August 31, 2017, there was $6.1 million of unrecognized compensation cost related to outstanding stock options, expected to be recognized over a weighted-average period of 1.54 years, and $63.1 million of unrecognized compensation cost related to unvested restricted stock units ("RSUs"), expected to be recognized over a weighted-average period of 2.79 years.
Our 2015 Employee Stock Purchase Plan (the "ESPP") allows eligible employee participants to purchase shares of our common stock at a discount through payroll deductions. The ESPP consists of offering periods that are six months in length and employees may purchase shares in each period at 85% of the lower of the Company’s fair market value on the first trading day of each offering period or on the purchase date. The ESPP will continue until the earlier to occur of (i) the termination of the ESPP by our board of directors, or (ii) June 15, 2035. As of August 31, 2017, we had reserved 750,000 shares of our common stock for issuance under the ESPP and 634,746 shares remain available for future issuance.
Stock Repurchase Program
In 2015, our board of directors authorized a stock repurchase program to repurchase shares of our common stock for an aggregate purchase price not to exceed $50.0 million through September 30, 2017.
The following table summarizes our common stock repurchases for the periods presented (in thousands, except per share data):
 
Three Months Ended August 31,
 
Six Months Ended August 31,
 
2017
 
2016
 
2017
 
2016
Total number of shares repurchased
—

 
464

 
331

 
482

Dollar amount of shares repurchased
$
—

 
$
6,961

 
$
6,546

 
$
7,241

Average price paid per share
$
—

 
$
14.99

 
$
19.75

 
$
15.03

Remaining amount authorized as of the period end
$
16,642

 
$
23,543

 
$
16,642

 
$
23,543