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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
 
We recognized $2.6 million and $1.0 million of stock-based compensation expense during the three months ended September 30, 2015 and 2014, respectively.

We recognized $5.1 million and $3.3 million of stock-based compensation expense during the nine months ended September 30, 2015 and 2014, respectively.

Equity awards granted during the quarter were as follows:
 
September 30,
2015
 
September 30,
2014
 
Number of
Shares
 
Weighted-
Average Grant-
Date Fair Value
 
Number of
Shares
 
Weighted-
Average Grant-
Date Fair Value
Stock options
907,364

 
$
0.68

 
116,210

 
$
2.21

Unvested shares
299,461

 
$
4.36

 
55,459

 
$
6.92

Performance stock units
349,809

 
$
2.13

 
22,666

 
$
6.04



In July 2015, we recognized $1.7 million of accelerated expense related to the July 9, 2015 resignation of Robert Philpott, our former President and Chief Executive Officer.

In connection with her hiring, in September 2015 we granted Karen Puckett (our new President and CEO) stock-based awards. These awards were inducement grants made outside of the 2013 Omnibus Incentive Plan, and without stockholder approval. These grants are included in the table above.