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STATEMENTS OF CASH FLOWS DATA (Tables)
 12 Months Ended
Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]  
Supplemental schedule of non-cash operating and investing activities

 

 

Year Ended December 31,

 

 

 

2020

 

 

2019

 

 

2018

 

 

 

(In thousands)

 

Supplemental operating and investing activities:

 

 

 

 

 

 

 

 

 

 

 

 

Net unrealized (loss) gain on

   marketable securities

 

$

(54

)

 

$

315

 

 

$

24

 

Operating lease assets obtained in

   exchange for operating lease liabilities

 

 

3,575

 

 

 

2,473

 

 

 

—

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Interest paid

 

$

388

 

 

$

—

 

 

$

—