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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Cash And Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments

Investments as of December 31, 2017 and December 31, 2016 consisted of the following (in thousands):

 

 

 

Amortized

 

 

Unrealized

 

 

Aggregate Fair

 

Investment Classification

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Market Value

 

December 31, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

1,296

 

 

$

1

 

 

$

(1

)

 

$

1,296

 

Corporate bonds

 

 

104,626

 

 

 

—

 

 

 

(252

)

 

 

104,374

 

U.S. Government bonds

 

 

214,641

 

 

 

—

 

 

 

(139

)

 

 

214,502

 

 

 

$

320,563

 

 

$

1

 

 

$

(392

)

 

$

320,172

 

December 31, 2016

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

3,362

 

 

$

3

 

 

$

—

 

 

$

3,365

 

Money market instruments

 

 

2,998

 

 

 

—

 

 

 

(2

)

 

 

2,996

 

Corporate bonds

 

 

209,595

 

 

 

6

 

 

 

(377

)

 

 

209,224

 

U.S. Government bonds

 

 

32,996

 

 

 

1

 

 

 

(3

)

 

 

32,994

 

 

 

$

248,951

 

 

$

10

 

 

$

(382

)

 

$

248,579