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Business Segments, Concentration of Credit Risk and Significant Customers
6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Business Segments, Concentration of Credit Risk and Significant Customers
Note 5. Business Segments, Concentration of Credit Risk and Significant Customers
The Company operates in one business segment and uses one measurement of profitability for its business. Net revenue is attributed to the United States and to all foreign countries based on the geographical location of the customer.
The Company recognized revenue from shipment of product and licensing of its technologies to customers by geographical location as follows (in thousands):
 
  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2019
  
2018
  
2019
  
2018
 
North America
 $2,587  $3,384  $5,074  $6,741 
Japan
  346   1,128   1,252   1,842 
Taiwan
  54   73   128   156 
Rest of world
  79   13   132   67 
  
 
 
  
 
 
  
 
 
  
 
 
 
Total net revenue
 $3,066  $4,598  $6,586  $8,806 
  
 
 
  
 
 
  
 
 
  
 
 
 
Customers who accounted for at least 10% of total net revenue were:
 
  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2019
  
2018
  
2019
  
2018
 
Customer A
  29  31  26  39
Customer B
  27  21  21  22
Customer C
  12  *  13  *
Customer D
  *  24  15  12
 
*
Represents less than 10%
Four customers accounted for 84% of accounts receivable at June 30, 2019. Three customers accounted for 63% of accounts receivable at December 31, 2018.