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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2018
Cash And Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments

Investments as of September 30, 2018 and December 31, 2017 consisted of the following (in thousands):

 

 

 

Amortized

 

 

Unrealized

 

 

Aggregate Fair

 

Investment Classification

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Market Value

 

September 30, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

400

 

 

$

—

 

 

$

—

 

 

$

400

 

Corporate bonds

 

 

188,832

 

 

 

4

 

 

 

(45

)

 

 

188,791

 

U.S. Government securities

 

 

225,824

 

 

 

1

 

 

 

(76

)

 

 

225,749

 

 

 

$

415,056

 

 

$

5

 

 

$

(121

)

 

$

414,940

 

December 31, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

1,296

 

 

$

1

 

 

$

(1

)

 

$

1,296

 

Corporate bonds

 

 

104,626

 

 

 

—

 

 

 

(252

)

 

 

104,374

 

U.S. Government securities

 

 

214,641

 

 

 

—

 

 

 

(139

)

 

 

214,502

 

 

 

$

320,563

 

 

$

1

 

 

$

(392

)

 

$

320,172