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Other Long-Term Liabilities | 6 Months Ended
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Jun. 30, 2024
Other Long-Term Liabilities |
Other Long-Term Liabilities | (6) Other Long-Term Liabilities ​ Other long-term liabilities include the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ | ​ | 2024 | ​ | 2023
​ | ​ | (In thousands)
Net deferred tax liabilities related to IPR&D (Note 11) | ​ | $ | 1,613 | ​ | $ | 1,613
Deferred income from sale of tax benefits | ​ |  | 2,790 | ​ | ​ | 3,720
Deferred revenue (Note 10) | ​ |  | 2,743 | ​ | ​ | 3,058
Total | ​ |  | 7,146 | ​ | ​ | 8,391
Less current portion | ​ |  | (3,673) | ​ | ​ | (3,988)
Long-term portion | ​ | $ | 3,473 | ​ | $ | 4,403
​ In March 2022, the Company received approval from the New Jersey Economic Development Authority and agreed to sell New Jersey tax benefits of $5.0 million to an independent third party for $4.7 million. Under the agreement, the Company must maintain a base of operations in New Jersey for five years or the tax benefits must be paid back on a pro-rata basis based on the number of years completed. The Company recognized $0.9 million and $0.9 million in other income related to the sale of these tax benefits during the six months ended June 30, 2024 and the six months ended June 30, 2023, respectively.

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