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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Summary of Long Term Debt Long-term debt consisted of the following:
(in thousands)June 30,
2022		December 31,
2021
Principal amount of long-term debt$32,500 $32,500 
Debt (discount) premium, net of accretion(238)277 
Cumulative accretion of end of term payments835 1,157 
Long-term debt$33,097 $33,934 
Less: current portion of long-term debt$(8,607)$(795)
Long-term debt, net of current portion$24,490 $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 June 30,Six Months Ended June 30,
2022202120222021
Total interest expense$918 $905 $1,827 $1,796 
Non-cash interest expense$198 $186 $397 $364 
Schedule of Future Principal Payments and the Final Payments Due
As of June 30, 2022, future principal and end-of-term payments due under the Hercules Loan Agreement were as follows (in thousands):
Year Ending December 31,Total
2022$— 
202319,971 
202413,364 
Long-term debt$33,335