7.           Leases

The Company leases office, laboratory space and vehicles under operating leases. In May 2023, the Company entered into a lease amendment to extend the term of the Lexington, Massachusetts headquarters lease by forty-eight months to August 31, 2028. The Company accounted for the lease amendment as a modification and recorded increases in the right-of-use-assets and lease liability of $8,515.

The components of lease cost for the year ended December 31, 2025, 2024 and 2023 are as follows:

Years Ended

December 31, 

2025

  ​ ​ ​

2024

2023

Operating lease cost

$

4,377

$

3,875

$

3,749

Variable lease cost

894

708

1,023

Short-term lease cost

15

153

-

Total lease cost

$

5,286

$

4,736

$

4,772

Variable lease costs primarily related to operating expense, taxes and insurance associated with the Company’s operating leases. As these costs are generally variable in nature, they are not included in the measurement of the operating lease asset and related lease liability.

December 31, 

2025

Weighted-average remaining lease term (years)

2.66

Weighted-average discount rate

6.98%

Maturities of operating leases liabilities were as follows:

As of December 31, 

2026

$

3,480

2027

4,164

2028

2,563

2029

193

2030

80

Thereafter

 

Total future minimum lease payments

$

10,480

Less imputed interest

(983)

Present value of lease liabilities

$

9,497

Historical Timeline

Fiscal YearFiled
2025Feb 24, 2026Showing above
2024Feb 25, 2025
2023Feb 28, 2024
2022Mar 2, 2023
2021Feb 24, 2022
2020Feb 25, 2021
2019Mar 5, 2020

About Leases Disclosures

Lease disclosures under ASC 842 provide a comprehensive view of a company's leased asset portfolio, including the split between operating and finance leases, discount rates used to present-value future payments, and the maturity schedule of lease obligations. This section reveals a significant source of off-balance-sheet commitments that were largely hidden before the current standard.

Key signals: the weighted-average discount rate affects the size of recorded lease liabilities — a higher rate reduces the reported obligation, so compare the chosen rate against the company's incremental borrowing rate. The operating versus finance lease mix affects both EBITDA and operating income presentation. Watch the maturity table for concentration risk: large payment cliffs in specific years may create cash flow pressure. Variable lease payments excluded from the liability measurement represent real obligations that do not appear on the balance sheet. Compare total lease costs against prior-year operating lease expense to assess the true economic burden.