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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2024
Stock-Based Compensation [Abstract]  
Schedule of 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, 2024 and options outstanding as of June 30, 2024 (in thousands, except exercise price):
       Options Outstanding 
           Weighted 
   Shares       Average 
   Available   Number of   Exercise 
   for Grant   Shares   Prices 
Balance as of December 31, 2023   39    36   $127.00 
RSUs granted   (2)   
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RSUs cancelled and returned to the 2019 Plan   2    
—
    
—
 
Options cancelled   
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    (1)  $147.64 
Balance as of March 31, 2024   39    35   $126.70 
RSUs granted   
—
    
—
    
—
 
RSUs cancelled and returned to the 2019 Plan   3    
—
    
—
 
Options cancelled   
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    (1)  $150.19 
Balance as of June 30, 2024   42    34   $125.99 
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, 2023   15   $69.63 
Granted   2   $1.55 
Cancelled   (2)  $53.54 
Non-vested shares as of March 31, 2024   15   $62.04 
Vested   (5)  $1.48 
Non-vested shares as of June 30, 2024   10   $52.73 
Schedule of Significant Ranges of Outstanding and Exercisable Options The following table summarizes significant ranges of outstanding and exercisable options as of June 30, 2024 (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 - $62.80   2    5.39   $62.80           2   $62.80   $
     —
 
$62.81 - $599.60         32    6.24   $108.13    28   $107.91   $
—
 
$0.00 - $599.60   34    6.18   $125.99    30   $128.17   $
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