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Marketable Securities
 9 Months Ended
Sep. 30, 2013
Marketable Securities [Abstract]  
Marketable Securities
Marketable Securities
Marketable securities consisted of the following (in thousands):
 
September 30, 2013
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Certificates of deposit
$
8,750

 
$
—

 
$
(7
)
 
$
8,743

Treasury bills
7,500

 
—

 
(1
)
 
7,499

Total marketable securities
$
16,250

 
$
—

 
$
(8
)
 
$
16,242

 
December 31, 2012
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Certificates of deposit
$
6,500

 
$
—

 
$
(1
)
 
$
6,499

Treasury bills
14,996

 
1

 
—

 
14,997

Total marketable securities
$
21,496

 
$
1

 
$
(1
)
 
$
21,496


Marketable securities are classified as either short-term or long-term in the condensed consolidated balance sheet based on their effective maturity date. All marketable securities as of September 30, 2013 and December 31, 2012 have original maturities ranging from three to 12 months and are classified as available-for-sale. Available-for-sale securities are recorded at fair value and any unrealized holding gains and losses, net of the related tax effect, are excluded from earnings and are reported as a separate component of accumulated other comprehensive income until realized. See Note 8, “Fair Value Measurements,” for a discussion of inputs used to measure the fair value of the Company’s available-for-sale securities.