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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2015
Segment Reporting [Abstract]  
Summary of Revenues on Percentage Basis by Geographic Regions
The following table summarizes revenues on a percentage basis by geographic regions, based on the country in which the customer is located.

 

     Quarters ended June 30,     Six months ended June 30,  
     2015     2014     2015     2014  

United States

      64 %      74 %      64 %      77 % 

South America

      14 %      —          14 %      —     

Japan

      2 %      6 %      2 %      6 % 

Europe

      19 %      17 %      19 %      13 % 

Other

      1 %      3 %      1 %      4 % 
  

 

 

    

 

 

    

 

 

    

 

 

  
     100 %      100 %      100 %      100 %