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Investments (Tables)
 6 Months Ended
Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]  
Summary of Amortized Cost and Estimated Fair Value of Investments by Contractual Maturity

The amortized cost and estimated fair value of investments, by contractual maturity are as follows:

 

 

 

June 30, 2021

 

(in thousands)

 

Amortized Cost

 

 

Gross Unrealized Holding Gains

 

 

Gross Unrealized Holding losses

 

 

Fair Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasuries maturing after one year through five years

 

$

75,118

 

 

$

—

 

 

$

—

 

 

$

75,118

 

Total

 

$

75,118

 

 

$

—

 

 

$

—

 

 

$

75,118