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Available-for-Sale-Securities
 3 Months Ended
Mar. 31, 2020
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):

 
March 31, 2020
 
December 31, 2019
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Corporate debt securities
$
—

 
$
—

 
$
—

 
$
—

 
$
11,673

 
$
3

 
$
(1
)
 
$
11,675

Money market funds
17,037

 
—

 
—

 
17,037

 
11,093

 
—

 
—

 
11,093

Total
$
17,037

 
$
—

 
$
—

 
$
17,037

 
$
22,766

 
$
3

 
$
(1
)
 
$
22,768



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):

 
March 31, 2020
 
December 31, 2019
Cash and cash equivalents
$
17,037

 
$
11,643

Marketable securities
—

 
11,125

Total
$
17,037

 
$
22,768



The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
 
 
March 31, 2020
 
Amortized Cost
 
Estimated Fair Value
Less than one year
$
17,037

 
$
17,037

Greater than one year
—

 
—

Total
$
17,037

 
$
17,037