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Investments (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Held-to-maturity
The following table summarizes adjusted cost, gross unrealized losses, and fair value by significant investment category. The Company’s commercial paper investments with original maturities greater than 90 days are classified as held-to-maturity investments on its balance sheets as of September 30, 2023 and December 31, 2022, respectively. The Company’s commercial paper investments with original maturities of 90 days or less are classified as cash equivalents on its balance sheets as of September 30, 2023 and December 31, 2022, respectively.
Amortized CostGross UnrealizedFair ValueNet Carrying Value
GainsLosses
As of September 30, 2023(In Thousands)
Cash equivalents
Commercial paper$2,964 $2 $— $2,966 $2,964 
Total cash equivalents$2,964 $2 $— $2,966 $2,964 
Investments
Commercial paper$20,732 $— $(16)$20,716 $20,732 
Total investments$20,732 $— $(16)$20,716 $20,732 
Amortized CostGross UnrealizedFair ValueNet Carrying Value
GainsLosses
As of December 31, 2022(In Thousands)
Investments
Commercial Paper$58,733 $— $(144)$58,589 $58,733 
Total investments$58,733 $— $(144)$58,589 $58,733 
The amortized cost and fair value of held-to-maturity securities as of September 30, 2023 and December 31, 2022, by contractual maturity, are shown below.
As of September 30, 2023Amortized CostFair Value
(In Thousands)
Within one year$20,732 $20,716 
After one year through five years— — 
After 5 years through 10 years— — 
After 10 years— — 
Total investments$20,732 $20,716 
As of December 31, 2022Amortized CostFair Value
(In Thousands)
Within one year$58,733 $58,589 
After one year through five years— — 
After 5 years through 10 years— — 
After 10 years— — 
Total investments$58,733 $58,589 
Unrealized Gain (Loss) on Investments
For those securities in an unrealized loss position, the length of time the securities were in such a position is as follows:

Less than 12 MonthsTotal
# of SecuritiesFair ValueUnrealized Losses# of SecuritiesFair ValueUnrealized Losses
As of September 30, 2023(Dollars In Thousands)
Investments
Commercial paper4 $20,716 $(16)4 $20,716 $(16)
Total4 $20,716 $(16)4 $20,716 $(16)
Less than 12 MonthsTotal
# of SecuritiesFair ValueUnrealized Losses# of SecuritiesFair ValueUnrealized Losses
As of December 31, 2022(Dollars In Thousands)
Investments
Commercial paper11 $58,589 $(144)11 $58,589 $(144)
Total11 $58,589 $(144)11 $58,589 $(144)