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Leases (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Lease Balances within the Balance Sheets The following table presents the lease balances within the balance sheets:
September 30, 2021December 31, 2020
Right-of-use assets:
Operating lease right-of-use asset$5,296 $5,805 
Operating lease liabilities:
Accrued expenses27 — 
Operating lease liability, non-current portion6,080 5,886 
Total operating lease liabilities$6,107 $5,886