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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2025
Stock-Based Compensation [Abstract]  
Schedulel of Fair Value of the Company’s Share-Based Payment Awards

The fair value of the Company’s share-based payment awards for the six months ended June 30, 2025 was estimated on the grant dates using the Black-Scholes model with the following assumptions:

 

   Six Months
Ended
June 30,
2025		 
Interest rate (risk-free rate)   4.34%
Expected volatility   119%
Expected term    4.38 years  
Expected dividend   0%
Fair value of option grants (in thousands)  $832 
Schedule of Shares Available for Grant Under the Plans and Options Outstanding

The following table summarizes the activity in the shares available for grant under the Plans during the three and six months ended June 30, 2025 and options outstanding as of June 30, 2025 (in thousands, except exercise price):

 

       Options Outstanding 
           Weighted 
   Shares       Average 
   Available   Number of   Exercise 
   for Grant   Shares   Prices 
Balance as of December 31, 2024   1,544    30   $130.14 
Options granted   (1,325)   1,325   $0.78 
RSUs granted   (2)   
—
    
—
 
Balance as of March 31, 2025   217    1,355   $130.14 
RSUs cancelled and returned to the 2019 Plan   1    
—
    
—
 
Options exercised   
—
    (5)  $0.78 
Options cancelled and returned to the 2019 Plan   95    (95)  $0.78 
Balance as of June 30, 2025   313    1,255   $3.54 
Schedule of Significant Ranges of Outstanding and Exercisable Options

The following table summarizes significant ranges of outstanding and exercisable options as of June 30, 2025 (in thousands, except contractual life and exercise price):

 

   Options Outstanding   Options Exercisable 
       Weighted                 
       Average                 
       Remaining   Weighted       Weighted     
       Contractual   Average       Average   Aggregate 
   Number   Life   Exercise   Number   Exercise   Intrinsic 
Range of Exercise Price  Outstanding   (in Years)   Price   Exercisable   Price   value 
$0.00 - $1.00   1,225    9.53   $0.78    142   $0.78   $44 
$1.01 - $62.80   2    4.39   $62.80    2   $62.80    
—
 
$62.81 - $599.60   28    5.53   $110.13    27   $110.32    
—
 
$0.00 - $599.60   1,255    9.43   $3.54    171   $53.22   $44 
Schedule of RSU Activity Under Plans

A summary of RSU activity under the Plans is presented below (in thousands, except for fair value):

 

       Weighted 
       Average 
   Number of   Grant-Date 
   Shares   Fair Value 
Non-vested shares as of December 31, 2024   2   $37.69 
Granted   2   $1.00 
Non-vested shares as of March 31, 2025   4   $18.88 
Vested   (1)  $42.65 
Non-vested shares as of June 30, 2025   3   $4.88