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Leases | 9 Months Ended
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Sep. 30, 2024
Leases |
Leases | 9. Leases ​ Operating Leases ​ Agreements for Office and Laboratory Space ​ The Company had a sublease agreement pursuant to which it subleased 33,019 square feet of office space for its headquarters in Wayne, Pennsylvania, which expired on October 31, 2023. ​ In May 2023, the Company entered into a new lease agreement pursuant to which it leases 11,564 square feet of office space for its headquarters in Wayne, Pennsylvania. The lease commenced on November 1, 2023 and has a term that runs through February 2029. ​ In February 2019, the Company entered into a sublease agreement for 20,433 square feet of office and laboratory space in St. Louis, Missouri. The lease commenced in June 2019 and has a term that runs through May 2029. In January 2023, the Company amended the sublease agreement to add an additional 6,261 square feet of office and laboratory space effective February 2023. The Company exercised its option to terminate the leasing of the additional space effective as of June 30, 2024. ​ Supplemental balance sheet information related to operating leases is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(In thousands) | ​ | 2024 | ​ | 2023
Operating Leases: | ​ | ​ | ​ | ​ | ​ | ​
Gross cost | ​ | $ | 4,530 | ​ | $ | 5,094
Accumulated amortization | ​ | ​ | (1,556) | ​ | ​ | (1,235)
Other assets | ​ | $ | 2,974 | ​ | $ | 3,859
​ | ​ | ​ | ​ | ​ | ​ | ​
Current portion of lease liabilities | ​ | $ | 465 | ​ | $ | 426
Other liabilities | ​ | ​ | 2,245 | ​ | ​ | 3,074
Total operating lease liabilities | ​ | $ | 2,710 | ​ | $ | 3,500
​ Amortization expense related to operating lease right-of-use assets and accretion of operating lease liabilities totaled $0.1 million and $0.2 million for the three months ended September 30, 2024 and 2023, respectively, and $0.4 million and $0.7 million for the nine months ended September 30, 2024 and 2023, respectively.

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