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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense Components
The following table summarizes the components and classification of stock-based compensation expense related to stock options, restricted stock units and awards (“RSUs” and “RSAs”), performance-based restricted stock units (“PSUs”) and the 2011 ESPP for the three months ended March 31, 2014 and 2013 (in thousands):
 
Three Months Ended
March 31,
 
2014
 
2013
Stock options
$
4,176

 
$
3,255

RSUs/RSAs
2,342

 
690

PSUs
—

 
35

ESPP
91

 
25

Stock-based compensation expense
$
6,609

 
$
4,005

Research and development
$
1,820

 
$
1,089

Sales, general and administrative
4,789

 
2,916

Stock-based compensation expense
$
6,609

 
$
4,005