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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Fair Values of Stock Options Granted and Assumptions used in Black-Scholes Model The estimated fair values of stock options granted, and the assumptions used for the Black-Scholes option pricing model were as follows:

Nine Months Ended September 30,
20242023
Estimated fair values of stock options granted$11.59 $— 
Assumptions:
Risk-free interest rate4.5 %— %
Expected volatility
99.8% - 102.5%
— %
Expected term (in years)
5.0 - 5.5
— 
Schedule of Stock Option Activity
Information on stock option activity is as follows:
 
Options
Exercisable
Weighted Average
Exercise
Price Per
Share
Options
Outstanding
Weighted Average
Exercise
Price Per
Share
Balance as of December 31, 2023108,781$365.07 109,521$367.35 
Granted—— 41,39614.82 
Vested18,72631.59 —— 
Exercised—— —— 
Forfeited—— (18)227.00 
Balance as of September 30, 2024127,507$316.09 150,899$270.66 
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense related to stock option awards is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Stock-based compensation expense$78 $40 $346 $1,835 


Stock-based compensation expense related to RSAs is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Stock-based compensation expense$2,418 $5,631 $7,274 $7,555 


Stock-based compensation expense related to RSUs is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Stock-based compensation expense$191 $157 $410 $2,550 


Stock-based compensation expense related to PSUs is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Stock-based compensation benefit$— $— $— $(270)
Certain condensed consolidated statement of operations amounts were as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Stock-based compensation expense:
Research and development$807 $2,853 $2,467 $5,531 
Selling, general, and administrative1,880 2,975 5,563 6,139 
Total$2,687 $5,828 $8,030 $11,670 
Schedule of Nonvested Share Activity Information on Class A restricted stock award activity is as follows:
 
Restricted Stock
Awards
Weighted Average Grant
Date Fair Value
Unvested balance as of December 31, 2023640,060$31.50 
Granted—— 
Vested(245,172)31.50 
Forfeited(2,791)31.50 
Unvested balance as of September 30, 2024392,097$31.50 
Information on restricted stock unit activity is as follows:
 
Restricted Stock
Units
Weighted Average Grant
Date Fair Value
Unvested balance as of December 31, 2023147,222$18.21 
Granted65,01918.60 
Vested(36,476)18.46 
Forfeited(60,224)18.15 
Unvested balance as of September 30, 2024115,541$18.38 
Schedule of Grant Date Fair Value of Awards Vested
The total fair value of RSAs that vested is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Fair value of shares vested$511 $964 $3,230 $1,145 
The total fair value of RSUs that vested is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Fair value of shares vested$— $92 $629 $2,126 
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award, Performance-Based Units, Vested and Expected to Vest The total fair value of PSUs that vested is as follows:
Three Months Ended September 30,Nine Months Ended September 30,
In Thousands2024202320242023
Fair value of shares vested$— $— $— $1,005