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Stock-Based Compensation and Common Stock (Tables)
 9 Months Ended
Sep. 30, 2015
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 and nine months ended September 30, 2015 and 2014 (in thousands):
 
Three Months Ended September 30,
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Stock options
$
2,466

 
$
3,340

 
$
7,921

 
$
11,670

RSUs/RSAs
1,212

 
2,748

 
4,322

 
6,665

ESPP
(154
)
 
200

 
69

 
358

Stock-based compensation expense
$
3,524

 
$
6,288

 
$
12,312

 
$
18,693

Research and development
$
1,011

 
$
1,941

 
$
3,595

 
$
5,671

Sales, general and administrative
2,513

 
4,347

 
8,717

 
13,022

Stock-based compensation expense
$
3,524

 
$
6,288

 
$
12,312

 
$
18,693