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Stock incentive plans
 12 Months Ended
Dec. 31, 2012
Stock incentive plans  
Stock incentive plans

13. Stock incentive plans

        In March 2011, our board of directors approved the 2011 Plan under which 5,511,288 shares of common stock are reserved for issuance. The 2011 Plan provides for the grant of incentive and nonstatutory stock options, stock appreciation rights, restricted shares of our common stock, stock units, and performance cash awards. As of January 1 of each year, the number of shares of common stock reserved for issuance under the 2011 Plan shall automatically be increased by a number equal to the lesser of (a) 4.5% of the total number of shares of common stock then outstanding, (b) 3,000,000 shares of common stock or (c) as determined by our board of directors. As of December 31, 2012, options to purchase 3,670,481 shares of common stock have been granted under the 2011 Plan.

        No further awards will be made under our 2001 Plan, which terminated pursuant to its terms. Options outstanding under the 2001 Plan will continue to be governed by their existing terms. As of December 31, 2012, options to purchase 2,344,742 shares of common stock were outstanding under the 2001 Plan.

        We recognized stock-based compensation expense as follows:

 
   Years ended
December 31,		  
 
   2012   2011   2010  

Network operations

   $ 352   $ 463   $ 131  

Development and technology

     352     577     115  

Selling and marketing

     571     650     171  

General and administrative

     1,460     1,733     450  
               

Total stock-based compensation expense

   $ 2,735   $ 3,423   $ 867  
               

        A summary of the stock option activity under the 2001 and 2011 Plans are as follows:

 
   Number
of
Options
(000's)		   Weighted
Average
Exercise
Price		   Weighted-
Average
Remaining
Contract
Life
(years)		   Aggregate
Intrinsic
Value		  

Outstanding at December 31, 2009

     5,281   $ 1.25     7.3   $ 8,471  

Granted

     53   $ 2.85              

Exercised

     (2 ) $ 0.90              

Cancelled/forfeited

     (44 ) $ 1.45              
                         

Outstanding at December 31, 2010

     5,288   $ 1.25     6.3   $ 38,279  

Granted

     2,381   $ 13.02              

Exercised

     (1,015 ) $ 1.01              

Cancelled/forfeited

     (53 ) $ 6.58              
                         

Outstanding at December 31, 2011

     6,601   $ 5.50     7.0   $ 30,996  

Granted

     1,391   $ 8.29              

Exercised

     (1,899 ) $ 1.36              

Cancelled/forfeited

     (1,048 ) $ 11.85              
                         

Outstanding at December 31, 2012

     5,045   $ 6.50     6.44   $ 14,742  
                         

Vested, exercisable and expected to vest at December 31, 2012

     4,855   $ 6.37     6.34   $ 14,690  

Exercisable at December 31, 2012

     2,776   $ 3.46     4.52   $ 13,964  

        The aggregate intrinsic value in the table above represents the difference between the estimated fair value of our common stock at December 31, 2012 and the option exercise price, multiplied by the number of in-the-money options at December 31, 2012. The intrinsic value changes are based on the estimated fair value of our common stock. The total intrinsic value of stock options exercised for the years ended December 31, 2012, 2011 and 2010 was $14,901, $9,754 and $3, respectively. At December 31, 2012, the total remaining stock-based compensation expense for unvested awards is $9,130, which is expected to be recognized over a weighted average period of 3.2 years.

        Stock options to purchase 1,899,000, 1,015,000 and 2,000 shares of our common stock were exercised during the years ended December 31, 2012, 2011 and 2010 for cash proceeds of $2,573, $1,028 and $2, respectively.

        The weighted average grant date fair value of options granted for the years ended December 31, 2012, 2011 and 2010 was $8.10, $6.68 and $1.80, respectively.

        We realized $372 and $246 of tax benefits for the deductions from stock option exercises during 2012 and 2011, respectively. There was no tax benefit realized for the tax deductions from stock options exercised during 2010.