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Cash and Cash Equivalents and Investments
 3 Months Ended
Mar. 31, 2020
Cash and Cash Equivalents and Investments [Abstract]  
Cash and Cash Equivalents Disclosure Cash and Cash Equivalents and Investments
 
The fair value of cash and cash equivalents and investments held at March 31, 2020 and December 31, 2019 are as follows: 
 As of March 31, 2020
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (in thousands)
Cash and cash equivalents$55,592  $—  $—  $55,592  
Securities maturing within one year:    
U.S. treasury securities192,685  860  193,545  
Total short-term investments$192,685  $860  $—  $193,545  
Total cash and cash equivalents and investments$248,277  $860  $—  $249,137  
 As of December 31, 2019
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
  (in thousands) 
Cash and cash equivalents$36,112  $—  $—  $36,112  
Securities maturing within one year:    
U.S. treasury securities235,463  94  (10) 235,547  
Total short-term investments$235,463  $94  $(10) $235,547  
Total cash and cash equivalents and investments
$271,575  $94  $(10) $271,659  

There were no realized losses during either of the three months ended March 31, 2020 and 2019, respectively. The cost of securities sold is based on the specific identification method.