Quarterly report pursuant to Section 13 or 15(d)

Warrants (Tables)

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Warrants (Tables)
 6 Months Ended
Jun. 30, 2024
Equity [Abstract]  
Schedule of Share-based Compensation Arrangements by Share-based Payment Award
Tenth Pre-Paid Advance
June Prepaid Advance
Stock price $ 2.13  $ 2.13 
Risk free interest rate 5.4  % 5.3  %
Interest rate 5.0  % 5.0  %
Expected volatility 116.7  % 144.0  %
Expected dividend yield —  % —  %
Remaining term (in years) 0.2 0.5
The following table summarizes the Company’s stock-based compensation expense by line item for the three and six months ended June 30, 2024 and 2023 (in thousands):
Three months ended
June 30,
 Six months ended June 30,
2024 2023 2024 2023
Research and development $ (680) $ 209  $ (50) $ 4,344 
Selling, general and administrative 1,808  6,498 12,132  12,199
Total $ 1,128  $ 6,707  $ 12,082  $ 16,543 
The key inputs used in the valuation were as follows:
Expected term (years) 10.0
Risk free interest rate 3.0  %
Expected volatility 91.3  %
Dividend yield —  %
Exercise price $ 49.45 
Stock price $ 83.49 
The key inputs used in the valuation were as follows:
Expected term (year) 4.7
Expected volatility 117.5  %
Dividend yield —  %
Risk free rate 4.3  %
Estimated fair value per warrant $ 1.82 
Exercise price $ 1.37 
Stock price $ 2.13 
The key inputs used in the valuation were as follows:
Expected term (years) 4.1
Expected volatility 117.5  %
Expected dividend rate —  %
Risk free rate 4.4  %
Estimated fair value per warrant $ 0.87 
Exercise price $ 29.90 
Stock price $ 2.13 
The key inputs used in the valuation were as follows:
Expected term (years) 4.5
Expected volatility 117.5  %
Expected dividend rate —  %
Risk free rate 4.3  %
Estimated fair value per warrant $1.18
Exercise price $15.41
Stock price $2.13
The key inputs used in the valuation were as follows:
Expected term (years) 4.3
Expected volatility 117.5  %
Expected dividend rate —  %
Risk free rate 4.4  %
Estimated fair value per warrant $1.14
Exercise Price $14.93
Stock Price $2.13
The key inputs used in the valuation were as follows:
Expected term (years) 4.6
Expected volatility 117.5  %
Expected dividend rate —  %
Risk free rate 4.3  %
Estimated fair value per warrant $ 1.20 
Exercise price $ 15.41 
Stock price $ 2.13 
The key inputs used in the valuation were as follows:
Expected term (years) 4.3
Expected volatility 117.5  %
Expected dividend rate —  %
Risk free rate 4.4  %
Estimated fair value per warrant $ 1.19 
Exercise price $ 12.91 
Stock price $ 2.13 
The key inputs used in the valuation were as follows:
Expected term (years) 4.8
Expected volatility 117.5  %
Expected dividend rate —  %
Risk free rate 4.3  %
Estimated fair value per warrant $ 1.74 
Exercise price $ 2.24 
Stock price $ 2.13