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Cash, Cash Equivalents and Marketable Securities
 9 Months Ended
Sep. 30, 2019
Cash and Cash Equivalents [Abstract]  
Cash, Cash Equivalents, and Marketable Securities Cash, Cash Equivalents and Marketable Securities
The following tables summarize the amortized cost and the estimated fair value of our cash, cash equivalents and marketable securities as of September 30, 2019 and December 31, 2018 (in thousands):
September 30, 2019
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Current assets:
Cash$23,568  $—  $—  $23,568  
Cash equivalents:
Commercial paper996  —  —  996  
Money market funds8,535  —  —  8,535  
Total cash equivalents9,531  —  —  9,531  
Total cash and cash equivalents33,099  —  —  33,099  
Marketable securities:
Commercial paper86,936  —  —  86,936  
Corporate debt securities81,835  425  (3) 82,257  
Certificate of deposits52,672  —  —  52,672  
Total marketable securities221,443  425  (3) 221,865  
Total cash, cash equivalents and marketable securities
$254,542  $425  $(3) $254,964  
December 31, 2018
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Current assets:
Cash$5,222  $—  $—  $5,222  
Cash equivalents:
Money market funds63,232  —  —  63,232  
Total cash and cash equivalents68,454  —  —  68,454  
Marketable securities:
Commercial paper152,940  —  —  152,940  
Corporate debt securities60,622  58  (75) 60,605  
Certificate of deposits128,647  —  —  128,647  
U.S. Treasury securities103,521  31  (11) 103,541  
Total marketable securities445,730  89  (86) 445,733  
Total cash, cash equivalents and marketable securities
$514,184  $89  $(86) $514,187  
The following table summarizes the cost and fair value of marketable securities based on stated effective maturities as of September 30, 2019 (in thousands):
Amortized Cost
Fair Value
Due within one year$168,397  $168,490  
Due between one and two years53,046  53,375  
Total$221,443  $221,865  
We determine realized gains or losses on the sale of marketable securities on a specific identification method. We recognized gross realized gains of $0.3 million for the three and nine months ended September 30, 2019. There were no sales of available-for-sale securities during the three and nine months ended September 30, 2018. We reflect these gains and losses as a component of other income (expense), net in the condensed consolidated statements of operations. As of September 30, 2019, available-for-sale debt securities that were in a continuous loss position but were not deemed to be other than temporarily impaired were not material.
See Note 6 for further information regarding the fair value of our financial instruments.