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Marketable Securities
 6 Months Ended
Jun. 30, 2016
Investments Debt And Equity Securities [Abstract]  
Marketable Securities

5. Marketable Securities

As of June 30, 2016 and December 31, 2015 the fair value of available-for-sale marketable securities by type of security was as follows:

 

 

 

June 30, 2016

 

(In thousands)

 

Amortized Cost

 

 

Gross Unrealized

Gains

 

 

Gross Unrealized

Losses

 

 

Fair Value

 

U.S. Government obligations

 

$

8,009

 

 

$

12

 

 

$

—

 

 

$

8,021

 

Corporate bonds

 

 

36,231

 

 

 

5

 

 

 

(6

)

 

 

36,230

 

 

 

$

44,240

 

 

$

17

 

 

$

(6

)

 

$

44,251

 

 

 

 

December 31, 2015

 

(In thousands)

 

Amortized Cost

 

 

Gross Unrealized

Gains

 

 

Gross Unrealized

Losses

 

 

Fair Value

 

Corporate Bonds

 

$

55,757

 

 

$

4

 

 

$

(101

)

 

$

55,660

 

 

 

$

55,757

 

 

$

4

 

 

$

(101

)

 

$

55,660

 

 

At June 30, 2016, all marketable securities consisted of investments that mature within twelve months.  At December 31, 2015, marketable securities consisted of $48,303,000 of investments that mature within twelve months and $7,357,000 of investments that mature within fifteen months.