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Accounting for stock-based compensation
3 Months Ended
Mar. 31, 2016
Accounting for stock-based compensation

8. Accounting for stock-based compensation

Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three months ended March 31, 2016 and 2015 was as follows (in thousands):

 

     Three months ended March 31,  
     2016      2015  

Stock-based compensation

   $ 1,273       $ 2,003   

During the three months ended March 31, 2016, the Company issued stock awards to employees with a four-year vesting schedule. The grant date fair value of the 2,364,200 restricted stock units and 4,920,267 stock options issued was $2,175,064 and $2,988,418, respectively, with a grant date fair value per share of $0.92 and $0.61, respectively.

As of March 31, 2016, there was $5.7 million and $7.4 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 3.0 years.