Quarterly report pursuant to Section 13 or 15(d)

Short-term Investments - Schedule of Available for Sale Short-term Investments by Major Security Type (Details)

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Short-term Investments - Schedule of Available for Sale Short-term Investments by Major Security Type (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Cost Total $ 60,230 $ 54,533
Unrealized gains 77 23
Unrealized (losses) (641) (658)
Fair Value Total 59,666 53,898
Maturity by period Less than 1 year 55,057 31,833
Maturity by period 1 to 5 years 4,609 22,065
Commercial Paper    
Schedule Of Available For Sale Securities [Line Items]    
Cost Total 37,321 37,549
Unrealized gains 69 17
Unrealized (losses) (203) (570)
Fair Value Total 37,187 36,996
Maturity by period Less than 1 year 35,483 31,833
Maturity by period 1 to 5 years 1,705 5,163
U.S. Treasury Bills    
Schedule Of Available For Sale Securities [Line Items]    
Cost Total 22,909 16,984
Unrealized gains 8 6
Unrealized (losses) (438) (88)
Fair Value Total 22,479 16,902
Maturity by period Less than 1 year 19,574  
Maturity by period 1 to 5 years $ 2,904 $ 16,902