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Available-for-Sale-Securities
 6 Months Ended
Jun. 30, 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):
June 30, 2020December 31, 2019
CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueCostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Corporate debt securities$6,430  $1  $(6) $6,425  $11,673  $3  $(1) $11,675  
Money market funds5,019  —  —  5,019  11,093  —  —  11,093  
Municipal debt securities20,975  —  (2) 20,973  —  —  —  —  
Sovereign government securities197  —  —  197  —  —  —  —  
Total$32,621  $1  $(8) $32,614  $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):
June 30, 2020December 31, 2019
Cash and cash equivalents$24,407  $11,643  
Marketable securities8,207  11,125  
Total$32,614  $22,768  

The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
 
June 30, 2020
Amortized CostEstimated Fair Value
Less than one year$32,621  $32,614  
Greater than one year—  —  
Total$32,621  $32,614