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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
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 March 31,

 

 

 

2019

 

 

2018

 

Cost of product sales

 

$

995

 

 

$

1,050

 

Research and development

 

 

7,880

 

 

 

7,657

 

Selling, general and administrative

 

 

11,008

 

 

 

11,735

 

 

 

$

19,883

 

 

$

20,442