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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock-based Compensation Expense Included in Statements of Operations

The following table summarizes the total stock-based compensation expense included in the Company’s statements of operations for the periods presented (in thousands):

 

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Cost of product sales

 

$

1,137

 

 

$

881

 

 

$

2,187

 

 

$

1,761

 

Research and development

 

 

7,894

 

 

 

6,420

 

 

 

15,551

 

 

 

11,721

 

Selling, general and administrative

 

 

11,521

 

 

 

10,943

 

 

 

23,256

 

 

 

20,333

 

 

 

$

20,552

 

 

$

18,244

 

 

$

40,994

 

 

$

33,815