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Long-term Debt (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
As of September 30, 2021 and December 31, 2020, long-term debt consisted of the following (in thousands):

September 30,December 31,
20212020
PPP Loan - 1% interest
$— $4,812 
Other Loans - various interest424 400 
Total debt424 5,212 
Current portion of long-term debt352 553 
Long-term debt$72 $4,659 
Schedule of Maturities of Future Principal Obligations of Long-term Debt
The following presents maturities of future principal obligations of long-term debt as of September 30, 2021 (in thousands):

Remainder of 2021$78 
2022346 
2023— 
2024— 
2025— 
Thereafter— 
Total$424