SUPPLEMENTARY CONSOLIDATED BALANCE SHEETS INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2016
Supplementary Statement Of Balance Sheet Information [Abstract]  
Schedule of other current assets
     
December 31,
  
     
2016
    
2015
  
     
U.S. dollars in thousands
  
a. Other current assets      
Government institutions
         803           1,822    
Prepaid expenses
         4,340           2,363    
Other account receivables
         4,811           4,612    
Interest receivable
         2,184           2,161    
Restricted bank deposits
         3,179           3,061    
Other
         681           798    
          15,998           14,817
Schedule of property and equipment
     
December 31,
  
     
2016
    
2015
  
     
U.S. dollars in thousands
  
b. Property and equipment, net      
Computers, electronic equipment and software
         19,432           12,538    
Vehicles
         1,241           1,007    
Office furniture and equipment
         1,047           759    
Leasehold improvements
         6,365           4,071    
Equipment
         545           476    
Prepayment of property(1)
         2,357           745    
          30,987           19,596    
Less – accumulated depreciation
         12,654           8,565    
          18,333           11,031    
 
 
(1)     See also note 7a.
Schedule of account payable and accrued expenses
   
December 31,
 
   
2016
  
2015
 
   
U.S. dollars in thousands
 
c. Account payable and accrued expenses   
Account payable
    26,832     17,461  
Accrued expenses
    12,583     7,132  
     39,415     24,593 
Schedule of other current Liabilities
     
December 31,
  
     
2016
    
2015
  
     
U.S. dollars in thousands
  
d. Other current Liabilities      
Institutions
         2,548           1,490    
Advances from NRE arrangements
         2,632           2,628    
Advances from customers
         1,169           1,712    
Other
         816           857    
          7,165           6,687