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Other Long-Term Liabilities | 6 Months Ended
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Jun. 30, 2022
Other Long-Term Liabilities |
Other Long-Term Liabilities | (6) Other Long-Term Liabilities ​ Other long-term liabilities include the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ | ​ | 2022 | ​ | 2021
​ | ​ | (In thousands)
Net deferred tax liabilities related to IPR&D (Note 11) | ​ | $ | 1,613 | ​ | $ | 1,613
Deferred Income From Sale of Tax Benefits | ​ |  | 4,650 | ​ |  | —
Contingent milestones (Note 3 and Note 13) | ​ | ​ | — | ​ | ​ | 6,862
Deferred revenue (Note 10) | ​ |  | 463 | ​ |  | 433
Total | ​ |  | 6,726 | ​ |  | 8,908
Less current portion | ​ |  | (1,393) | ​ |  | (1,554)
Long-term portion | ​ | $ | 5,333 | ​ | $ | 7,354
​ 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.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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