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Leases | 12 Months Ended
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Dec. 31, 2020
Leases |
Leases | 5. Leases The Company is party to two operating leases for office and laboratory space. The Company’s finance leases are immaterial both individually and in the aggregate. The Company has elected to apply the short-term lease exception to all leases of one year or less. Rent expense for years ended December 31, 2020, 2019 and 2018 was $327,205, $278,603 and $263,518, respectively, which are included in operating expenses. The Company has an operating lease in Boston, Massachusetts for office space. The lease will expire in December 2021 and does not have any renewal options. The Company also has an operating lease for office and laboratory space in Solna, Sweden that expires in June 2022. Quantitative information regarding the Company’s leases for the years ended December 31, 2020 and 2019 is as follows:
|  | Year ended December 31,
Lease Cost |  | 2020 |  | 2019
Operating lease cost |  | $ | 226,275 |  | $ | 161,856
Other Information |  |  |  |  |  |
Operating cash flows paid for amounts included in the measurement of lease liabilities |  | $ | 251,636 |  | $ | 174,846
Operating lease liabilities arising from obtaining right‑of‑use assets |  | $ | — |  | $ | 355,330
Weighted average remaining lease term (years) |  |  | 1.00 - 1.50 |  |  | 2.0 - 2.5
Weighted average discount rate |  |  | 3.0 - 4.3% |  |  | 3.0 - 4.3%
Future lease payments under noncancelable leases are as follows at December 31, 2020:
|  | Operating
Future Lease Payments |  | Leases
2021 |  | $ | 270,816
2022 |  |  | 72,296
Total Lease Payments |  | $ | 343,112
Less: Imputed Interest |  |  | (7,956)
Total Lease Liabilities |  | $ | 335,156
As most of the Company’s leases do not provide an implicit rate, the Company used its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The Company uses the incremental borrowing rate on January 1, 2019 for operating leases that commenced prior to that date.

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