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Other long-term liabilities (Tables)
 12 Months Ended
Dec. 31, 2015
Other Liabilities Disclosure [Abstract]  
Other Long-term Liabilities
Other long-term liabilities consisted of the following (in thousands):
December 31:
 
2015
 
2014
Liability for severance pay
 
$
2,729

 
$
2,624

Long-term portion of deferred revenue
 
1,036

 
1,330

Other
 
81

 
350

Total other long-term liabilities
 
$
3,846

 
$
4,304