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Cash and Cash Equivalents and Investments
 12 Months Ended
Dec. 31, 2019
Cash and Cash Equivalents and Investments [Abstract]  
Cash and Cash Equivalents and Investments Cash and Cash Equivalents and Investments
The fair value of cash and cash equivalents and investments held at December 31, 2019 and 2018 are as follows:
 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  
 
 As of December 31, 2018
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
  (in thousands) 
Cash and cash equivalents$80,386  $—  $—  $80,386  
Securities maturing within one year:   
U.S. treasury securities73,983  —  (9) 73,974  
Corporate debt securities5,695  —  (3) 5,692  
Total short-term investments$79,678  $—  $(12) $79,666  
Total cash and cash equivalents and investments$160,064  $—  $(12) $160,052  
There were no realized gains or losses for the years ended December 31, 2019 and 2018.