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Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value
The following table sets forth the Company's financial instruments on the balance sheet that were measured at fair value on a recurring basis for the period indicated by level within the fair value hierarchy (in millions):
June 30, 2024
Level 1
Level 2
Level 3
Total
Financial assets:
Money market funds
$145.9 $— $— $145.9 
Total
$145.9 $— $— $145.9 
Financial liabilities:
Warrants
$— $— $20.4 $20.4 
Total
$— $— $20.4 $20.4 
Schedule of Carrying Amounts and Estimated Fair Values
The following table presents the carrying amounts and estimated fair values of the financial instruments that are not recorded at fair value on the condensed balance sheets (in millions):
June 30, 2024December 31, 2023
Net Carrying AmountEstimated Fair ValueNet Carrying AmountEstimated Fair Value
2025 Convertible senior notes$26.6 $25.0 $170.6 $128.2 
2028 Convertible senior notes$276.2 $130.3 $281.9 $100.0 
Schedule of Fair Value Measurement Inputs and Valuation Techniques
The aggregate fair value of the Warrants upon issuance and as of June 30, 2024 was $10.4 million and $20.4 million, respectively, determined using a Black-Scholes Model with the following inputs:
On issuanceJune 30, 2024
Stock price$1.77$3.19
Exercise price$1.71$1.71
Expected life in years
5.004.67
Expected volatility
94.84 %95.73 %
Expected dividends
— %— %
Discount rate
4.26 %4.33 %
Schedule Of Warrants
The following table presents the activity related to the Warrants during the three and six months ended June 30, 2024.
Three Months Ended June 30, 2024Six Months Ended June 30, 2024
Opening balance
$26,000 $— 
Issuance of warrants
— 10,417 
Change in fair value
(5,630)9,953 
Balance as of June 30, 2024
$20,370 $20,370