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OTHER NON-CURRENT LIABILITIES
 12 Months Ended
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]  
OTHER NON-CURRENT LIABILITIES
OTHER NON-CURRENT LIABILITIES
Other non-current liabilities consist of the following as of December 31:
(in thousands)
 
2018
 
2017
 
 
 
 
 
Income tax liabilities
 
$
7,069

 
$
5,955

Deferred revenue
 
19

 
2,101

Other non-current liabilities
 
2,090

 
4,226

 
 
 
 
 
Total
 
$
9,178

 
$
12,282