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Fair Value
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Fair Value
The following fair value hierarchy tables present information about each major category of the Company’s financial assets and liabilities measured at fair value on a recurring basis (in thousands):
 Fair Value Measurement at March 31, 2024
 Fair ValueLevel 1Level 2Level 3
Assets
Money market funds$72,961 $72,961 $— $— 
Total assets at fair value72,961 72,961 $— $— 
 Fair Value Measurement at December 31, 2023
 Fair ValueLevel 1Level 2Level 3
Assets
Money market funds$34,087 $34,087 $— $— 
Total assets at fair value$34,087 $34,087 $— $— 

There were no transfers between Level 1, Level 2 or Level 3 assets during the periods presented.
For the Company’s money market funds which are included as a component of cash and cash equivalents on the consolidated balance sheet, realized gains and losses are included in interest income (expense) on the consolidated statements of operations.
Our money market fund account is held in our bank in the U.S. and was earning interest at a rate of 5.2% in a U.S. Government money market fund.
The Company has cash balances in banks in excess of the maximum amount insured by the FDIC and other international agencies as of March 31, 2024. The Company has not historically experienced any credit losses with balances in excess of FDIC limits.
The Company recorded tranche rights of $23.6 million at January 8, 2024 as a result of the January 2024 Financing (see note 6). The fair value measurement of the tranche rights associated with the January 2024 Financing was classified as Level 3 under the fair value hierarchy. The fair value of the the tranche rights was determined using a Black Scholes Option Pricing Model. The inputs to this model included a risk-free rate range of 3.93%-4.36%, a stock price volatility range of 105-115%, an expected dividend rate of —% and remaining term of 1.81-4.81 years. This liability was revalued on March 4, 2024, upon approval to increase its authorized shares of common stock from 130 million to 500 million, which resulted in the reclassification of the tranche rights from a liability to equity. This revaluation resulted in an increase in the tranche rights liability of $4.8 million using a Black Scholes Option Pricing Model. The inputs to this model as of the date of the reclassification included a risk-free rate range of 4.16%-4.63%, a stock price volatility range of 90-105%, an expected dividend rate of —% and remaining term of 1.66-4.66 years. The inputs used in the determination of fair value of the liability are level 3 inputs. A rollforward of the fair value of the tranche rights is as follows (in thousands):
December 31, 2023$— 
Fair value as of January 8, 2024$23,600 
Change in fair value through March 4, 2024$4,796 
Reclassification to equity$(28,396)
March 31, 2024$— 
The carrying amounts of other current assets and prepaid expenses, accounts payable, accrued expenses, and other current liabilities approximate their fair values due to their short-term nature. The fair value and book value of the money market funds presented in the table above are the same.