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Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2020
Other Long-Term Liabilities |
Other Long-Term Liabilities | (10) Other Long‑Term Liabilities Other long‑term liabilities include the following:
|  | December 31, |  | December 31,
|  | 2020 |  | 2019
|  | (In thousands)
Net deferred tax liabilities related to IPR&D (Note 15) |  | $ | 1,840 |  | $ | 3,007
Deferred income from sale of tax benefits |  |  | — |  |  | 1,831
Contingent milestones (Note 4) |  |  | 8,267 |  |  | 12,485
Deferred revenue (Note 13) |  |  | 3,386 |  |  | 254
Total |  |  | 13,493 |  |  | 17,577
Less current portion |  |  | (3,372) |  |  | (2,026)
Long-term portion |  | $ | 10,121 |  | $ | 15,551
In November 2015, the Company received approval from the New Jersey Economic Development Authority and agreed to sell New Jersey tax benefits of $9.8 million to an independent third party for $9.2 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. During the years ended December 31, 2020, 2019 and 2018, the Company recorded $1.8 million, $2.4 million and $2.5 million to other income related to the sale of these tax benefits, respectively.

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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 http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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