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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2019
Cash And Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments Investments as of March 31, 2019 and December 31, 2018 consisted of the following (in thousands):

 

 

 

Amortized

 

 

Unrealized

 

 

Aggregate Fair

 

Investment Classification

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Market Value

 

March 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

1,100

 

 

$

1

 

 

$

(1

)

 

$

1,100

 

U.S. Government bonds

 

 

437,132

 

 

 

21

 

 

 

(9

)

 

 

437,144

 

 

 

$

438,232

 

 

$

22

 

 

$

(10

)

 

$

438,244

 

December 31, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

500

 

 

$

—

 

 

$

(1

)

 

$

499

 

Corporate bonds

 

 

114,678

 

 

 

1

 

 

 

(19

)

 

 

114,660

 

U.S. Government bonds

 

 

317,984

 

 

 

14

 

 

 

(43

)

 

 

317,955

 

 

 

$

433,162

 

 

$

15

 

 

$

(63

)

 

$

433,114