Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2015
Related Party Transactions  
Schedule of revenue from product sales to companies affiliated with investors

The following table sets forth revenue from product sales to these companies (in thousands):

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

December 31,

 

    

2013

    

2014

    

Company 1

 

$

2,889

 

$

4,108

 

Company 2

 

 

950

 

 

682

 

Company 3

 

 

426

 

 

19

 

Company 4

 

 

129

 

 

 —

 

 

 

$

4,394

 

$

4,809