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Long-term Debt (Tables)
9 Months Ended
Sep. 30, 2021
Long-term Debt [Abstract]  
Future Minimum Principal Payments
Future minimum principal payments at September 30, 2021 are as follows (in thousands):

2024
 
$
1,000
 
2025
   
4,000
 
2026
   
3,000
 
Total
 
$
8,000