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Marketable Securities
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
MARKETABLE SECURITIES
Our investments with original maturities of more than three months at time of purchase are considered marketable securities available for sale.
Our marketable securities consist of commercial paper and certificates of deposit as follows (in thousands):
 
 
June 30,
 
December 31,
 
 
2015
 
2014
 
 
Cost
 
Fair Value
 
Cost
 
Fair Value
Commercial paper
 
$
4,992

 
$
4,993

 
$
—

 
$
—

Certificates of deposit
 
8,547

 
8,545

 
3,083

 
3,083

Total marketable securities
 
$
13,539

 
$
13,538

 
$
3,083

 
$
3,083


    


The maturities of our marketable securities available for sale as of June 30, 2015 are as follows:
 
 
Earliest
 
 
 
Latest
Commercial paper
 
10/7/2015
 
to
 
1/21/2016
Certificates of deposit
 
9/2/2015

to

6/5/2017

The value and liquidity of the marketable securities we hold are affected by market conditions, as well as the ability of the issuers of such securities to make principal and interest payments when due, and the functioning of the markets in which these securities are traded. Our current investments in marketable securities are expected to be liquidated during the next twelve months.
As of June 30, 2015, we do not believe any of the underlying issuers of our marketable securities are presently at risk of default.