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Accounting for stock-based compensation
6 Months Ended
Jun. 30, 2015
Accounting for stock-based compensation

10. Accounting for stock-based compensation

Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2015 and 2014 was as follows (in thousands):

 

     Three months ended June 30,      Six months ended June 30,  
     2015      2014      2015      2014  

Stock-based compensation

   $ 1,775       $ 40,644       $ 3,778       $ 51,583   

During the three months ended March 31, 2015, the Company issued stock awards to employees with a four-year vesting schedule. The grant date fair value of the 36,300 restricted stock units and 73,600 stock options issued was $262,086 and $382,720, respectively, with a grant date fair value per share of $7.22 and $5.20, respectively.

During the three months ended June 30, 2015, the Company issued stock awards to employees with a four-year vesting schedule. The grant date fair value of the 194,704 restricted stock units and 208,000 stock options issued was $901,480 and $603,802 respectively, with a grant date fair value per share of $4.63 and $2.90, respectively.

As of June 30, 2015, there was $7.3 million and $8.6 million of unrecognized compensation cost related to options and restricted stock units, respectively, which are expected to be recognized over the remaining weighted average vesting period of 2.6 years.