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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Summary of Outstanding Common Stock Warrants

As of September 30, 2024 and December 31, 2023, the following table summarizes the Company's outstanding common stock warrants:

 

 

 

As of September 30, 2024

 

 

As of December 31, 2023

 

 

 

 

 

Number of Common Warrant Shares

 

 

Weighted Average Exercise Price per Share

 

 

Number of Common Warrant Shares

 

 

Weighted Average Exercise Price per Share

 

 

Expiration Date

Common stock warrants

 

 

7,904

 

 

$

388.94

 

 

 

7,904

 

 

$

388.94

 

 

November 2024

March 2022 Common warrants

 

 

1,273,077

 

 

$

4.50

 

 

 

1,929,066

 

 

$

4.50

 

 

March 2027

May 2023 Tranche A pre-funded warrants

 

 

1,250,647

 

 

$

0.01

 

 

 

2,758,281

 

 

$

0.01

 

 

November 2026

May 2023 Tranche B warrants

 

 

4,935,305

 

 

$

2.50

 

 

 

6,750,000

 

 

$

2.50

 

 

November 2026 (1)

May 2023 Tranche B pre-funded warrants

 

 

451,632

 

 

$

0.01

 

 

 

451,632

 

 

$

0.01

 

 

November 2026

October 2023 pre-funded warrants

 

 

250,000

 

 

$

0.01

 

 

 

1,175,000

 

 

$

0.01

 

 

N/A

Total

 

 

8,168,565

 

 

 

 

 

 

13,071,883

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) Subject to earlier expiration as described above.

Summary of Stock Based Compensation Expense

Stock-based compensation expense was recognized in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Research and development

$

18,516

 

 

$

935

 

 

$

23,682

 

 

$

1,587

 

General and administrative

 

38,082

 

 

 

1,266

 

 

 

46,521

 

 

 

2,449

 

Total

$

56,598

 

 

$

2,201

 

 

$

70,203

 

 

$

4,036

 

Schedule of Fair Value of Award Granted Using Black-Scholes Option Pricing Model The fair value of each award granted was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:

 

 

Three Months Ended September 30,

 

Nine Months Ended September 30,

 

2024

 

2023

 

2024

 

2023

Expected life (years)

6.1

 

5.3-6.0

 

5.8-6.1

 

5.3-6.0

Risk-free interest rate

3.7%-3.8%

 

4.0%-4.4%

 

3.7%-4.6%

 

3.5%-4.4%

Volatility

121%

 

98%-100%

 

121%-124%

 

98%-100%

Dividend rate

  %

 

  %

 

  %

 

  %

Summary of Stock Option and Restricted Stock Unit Transactions

The following table summarizes stock option transactions for the nine months ended September 30, 2024 which were for awards issued under the 2014 Plan and the Inducement Plan:

 

 

 

Number of
Options

 

 

Weighted-
Average
Exercise
Price per

 

 

Weighted
Average
Remaining
Contractual
Term

 

 

Aggregate Intrinsic Value

 

 

 

Outstanding

 

 

Share

 

 

(in years)

 

 

(in thousands)

 

Balance at January 1, 2024

 

 

2,369,665

 

 

$

11.56

 

 

 

8.72

 

 

$

70,834

 

Options granted

 

 

1,369,230

 

 

 

42.91

 

 

 

 

 

 

 

Options exercised

 

 

(171,520

)

 

 

7.59

 

 

 

 

 

 

 

Options canceled/forfeited

 

 

(44,124

)

 

 

42.30

 

 

 

 

 

 

 

Balance at September 30, 2024

 

 

3,523,251

 

 

$

23.55

 

 

 

8.55

 

 

$

97,143

 

Options exercisable at September 30, 2024

 

 

1,116,184

 

 

$

15.67

 

 

 

7.40

 

 

$

41,095

 

Options vested and expected to vest at September 30, 2024

 

 

3,523,251

 

 

$

23.55

 

 

 

8.55

 

 

$

97,143

 

Summary of Restricted Stock Unit Transactions

The following table summarizes restricted stock unit transactions for the nine months ended September 30, 2024 as issued under the 2014 Plan:

 

 

Number of
Restricted Stock Units

 

 

Weighted-
Average
Grant-Date Fair Value per Share

 

Outstanding at January 1, 2024

 

 

15,534

 

 

$

43.92

 

Restricted stock units granted

 

 

2,007,530

 

 

$

46.47

 

Restricted stock units vested

 

 

(950,534

)

 

$

45.81

 

Restricted stock units canceled/forfeited

 

 

-

 

 

$

0.00

 

Outstanding at September 30, 2024

 

 

1,072,530

 

 

$

47.02