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Long-Term Debt
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Long-Term Debt Long-Term Debt In June 2018, the Company entered into an Assistance Agreement with the State of Connecticut (the "2018 Assistance Agreement") to provide funding for the expansion and renovation of laboratory and office space (the "Project"). Under the terms of the 2018 Assistance Agreement, the Company was entitled to borrow from the State of Connecticut a maximum of $2.0 million, provided that the funding did not exceed more than 50% of the total Project costs. In September 2018, the Company borrowed $2.0 million under the 2018 Assistance Agreement, bearing interest at 3.25% per annum with interest payments required for the first 60 months from the funding date. Thereafter, the loan will begin to fully amortize through month 120, maturing in September 2028. In April 2021, borrowings totaling $1.0 million were forgiven by the State of Connecticut as the Company met certain employment conditions, as defined in the agreement. The 2018 Assistance Agreement requires that the Company be located in the State of Connecticut through September 2028 with a default penalty of repayment of the full original funding amount of $2.0 million plus liquidated damages of 7.5% of the total amount of funding received.
In connection with an Assistance Agreement with the State of Connecticut (the "Assistance Agreement") entered into in 2014, under which all the borrowings by the Company were forgiven in accordance with the Assistance Agreement, the Company is required to be located in the State of Connecticut through January 2024, with a default penalty of repayment of the full original funding amount of $2.5 million plus liquidated damages of 7.5%.
Minimum future principal payments on long-term debt as of December 31, 2022 are as follows:
(dollars in millions)
2023$— 
20240.2 
20250.2 
20260.2 
20270.2 
Thereafter0.2 
Total$1.0 
During the years ended December 31, 2022 and 2021, interest expense was immaterial. During the year ended December 31, 2020, interest expense totaled $0.1 million.