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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity

The following table summarizes our stock option activity:

   Stock
Options
   Weighted
Average
Exercise
Price
 
Outstanding December 31, 2020   1,360   $106.00 
Outstanding September 30, 2021   1,360   $106.00 
Exercisable as of September 30, 2021   1,163   $106.00