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Available-for-Sale-Securities
 9 Months Ended
Sep. 30, 2018
Available-for-sale Securities [Abstract]  
Available-for-Sale Securities
Available-for-Sale-Securities
 
The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):

 
September 30, 2018
 
December 31, 2017
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Corporate debt securities
$
32,409

 
$
—

 
$
(29
)
 
$
32,380

 
$
42,701

 
$
—

 
$
(28
)
 
$
42,673

Money market funds
8,316

 
—

 
—

 
8,316

 
9,212

 
—

 
—

 
9,212

Total
$
40,725

 
$
—

 
$
(29
)
 
$
40,696

 
$
51,913

 
$
—

 
$
(28
)
 
$
51,885



Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale securities in our Consolidated Balance Sheets (in thousands):

 
September 30, 2018
 
December 31, 2017
Cash and cash equivalents
$
8,920

 
$
25,968

Marketable securities
31,776

 
25,917

Total
$
40,696

 
$
51,885



The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
 
 
September 30, 2018
 
Amortized Cost
 
Estimated Fair Value
Less than one year
$
40,725

 
$
40,696

Greater than one year
—

 
—

Total
$
40,725

 
$
40,696