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Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2023
Other Long-Term Liabilities |
Other Long-Term Liabilities | (10) Other Long-Term Liabilities Other long-term liabilities include the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2023 | ​ | 2022
​ | ​ | (In thousands)
Net deferred tax liabilities related to IPR&D (Note 15) | ​ | $ | 1,613 | ​ | $ | 1,613
Deferred income from sale of tax benefits | ​ | ​ | 3,720 | ​ | ​ | 4,650
Deferred revenue (Note 13) | ​ | ​ | 3,058 | ​ | ​ | 60
Total | ​ | ​ | 8,391 | ​ | ​ | 6,323
Less current portion | ​ | ​ | (3,988) | ​ | ​ | (990)
Long-term portion | ​ | $ | 4,403 | ​ | $ | 5,333
​ 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 in other income related to the sale of these tax benefits during the year ended December 31, 2023.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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