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STATEMENTS OF CASH FLOWS DATA (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental schedule of non-cash operating and investing activities

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

 

 

(In thousands)

 

Supplemental investing activities:

 

 

 

 

 

 

 

 

 

 

 

 

Net unrealized gain (loss) on marketable securities

 

$

24

 

 

$

(154

)

 

$

160