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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Summary of Long Term Debt Long-term debt consisted of the following:
(in thousands)September 30,
2022		December 31,
2021
Principal amount of long-term debt$32,500 $32,500 
Debt (discount) premium, net of accretion(221)277 
Cumulative accretion of end of term payments1,075 1,157 
Long-term debt$33,354 $33,934 
Less: current portion$(14,621)$(795)
Long-term debt, net of current portion$18,733 $33,139 
Interest Income and Interest Expense Disclosure
The Company recognized interest expense under the Hercules Loan Agreement as follows:
(in thousands)Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Total interest expense$1,018 $920 $2,845 $2,716 
Non-cash interest expense$256 $193 $653 $557 
Schedule of Future Principal Payments and the Final Payments Due
As of September 30, 2022, future principal and accrued end-of-term payments due under the Hercules Loan Agreement were as follows (in thousands):
Year Ending December 31,Total
2022$— 
202320,050 
202413,525 
Long-term debt$33,575