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Fair Value Measurements
12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
Accounting standards define fair value, outline a framework for measuring fair value, and detail the required disclosures about fair value measurements. Under these standards, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in the principal or most advantageous market. Standards establish a hierarchy in determining the fair market value of an asset or liability. The fair value hierarchy has three levels of inputs, both observable and unobservable. Standards require the utilization of the highest possible level of input to determine fair value.

Level 1 – inputs include quoted market prices in an active market for identical assets or liabilities.

Level 2 – inputs are market data, other than Level 1, that are observable either directly or indirectly. Level 2 inputs include quoted market prices for similar assets or liabilities, quoted market prices in an inactive market, and other observable information that can be corroborated by market data.

Level 3 – inputs are unobservable and corroborated by little or no market data.
The carrying value and fair value, by fair value hierarchy, of the Company's financial instruments at December 31, 2022 and 2021 are as follows (in thousands):
  
Fair Value Measurements at December 31, 2022
 
Fair Value at December 31, 2022
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Recurring    
Marketable securities    
U.S. Treasury notes$56,074 $56,074 $— $— 
U.S. Government sponsored enterprise securities111,334 111,334 — — 
Total recurring$167,408 $167,408 $— $— 

  
Fair Value Measurements at December 31, 2021
 
Fair Value at
December 31, 2021
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Recurring
Marketable securities
U.S. Treasury notes$225,792 $225,792 $— $— 
U.S. Government sponsored enterprise securities113,944 113,944 — — 
Other
Liability-classified restricted stock awards702 702 — — 
Total recurring$340,438 $340,438 $— $— 

The Company had no transfers of assets or liabilities between fair value hierarchy levels during the years ended December 31, 2022 and 2021.

For the 2021 Bonds, the fair values are estimated using the Black-Derman-Toy interest rate lattice framework. The effective maturity of the 2021 Bonds was assumed to be April 1, 2024 (three years from issuance) with repayment of 100% of principal on that date. The impact of the Company's optional redemption feature, effective October 1, 2022, is appropriately captured by the Black-Derman-Toy interest rate lattice. The carrying values and estimated fair values of the 2021 Bonds as of December 31, 2022 are summarized as follows (in thousands):
 Carrying ValueEstimated Fair Value
2021 Bonds$67,223 $65,438