XML 74 R28.htm IDEA: XBRL DOCUMENT v3.20.1
STATEMENTS OF CASH FLOWS DATA (Tables)
 12 Months Ended
Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]  
Supplemental schedule of non-cash operating and investing activities

 

 

Year Ended December 31,

 

 

 

2019

 

 

2018

 

 

2017

 

 

 

(In thousands)

 

Supplemental investing activities:

 

 

 

 

 

 

 

 

 

 

 

 

Net unrealized gain (loss) on marketable securities

 

$

315

 

 

$

24

 

 

$

(154

)

Operating lease assets obtained in exchange for

   operating lease liabilities

 

 

2,473

 

 

 

—

 

 

 

—