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Available-for-Sale-Securities
 6 Months Ended
Jun. 30, 2019
Debt Securities, Available-for-sale [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):

 
June 30, 2019
 
December 31, 2018
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Corporate debt securities
$
21,901

 
$
3

 
$
(3
)
 
$
21,901

 
$
33,536

 
$
—

 
$
(32
)
 
$
33,504

Money market funds
8,852

 
—

 
—

 
8,852

 
4,314

 
—

 
—

 
4,314

Total
$
30,753

 
$
3

 
$
(3
)
 
$
30,753

 
$
37,850

 
$
—

 
$
(32
)
 
$
37,818



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):

 
June 30, 2019
 
December 31, 2018
Cash and cash equivalents
$
8,852

 
$
5,064

Marketable securities
21,901

 
32,754

Total
$
30,753

 
$
37,818



The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
 
 
June 30, 2019
 
Amortized Cost
 
Estimated Fair Value
Less than one year
$
30,753

 
$
30,753

Greater than one year
—

 
—

Total
$
30,753

 
$
30,753