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Intangibles | 12 Months Ended
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Dec. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangibles | 5. INTANGIBLES All of our intangible assets are subject to amortization and are amortized using the straight-line method over their estimated useful life. We acquired license and supply agreements, in relation to cytisinicline, upon the acquisition of Extab Corporation, or Extab, in 2015. The agreements were determined to have a fair value of $3.1 million with an estimated useful life of 14 years. The components of intangible assets were as follows:
|  | December 31, 2021 |  |  | December 31, 2020 |
|  | Gross Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Gross Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Value |  |  | Amortization |  |  | Value |  |  | Value |  |  | Amortization |  |  | Value |
License Agreements |  | $ | 3,117 |  |  | $ | (1,476 | ) |  | $ | 1,641 |  |  | $ | 3,117 |  |  | $ | (1,253 | ) |  | $ | 1,864 |
For the year ended December 31, 2021 and 2020 we recorded license agreement amortization expense of $0.2 million and $0.2 million, respectively. The following table outlines the estimated future amortization expense related to intangible assets held as of December 31, 2021:
Year Ending December 31, |  |  |  |
2022 |  |  | 223 |
2023 |  |  | 223 |
2024 |  |  | 223 |
2025 |  |  | 223 |
Thereafter |  |  | 749 |
Total |  | $ | 1,641 |
We evaluate the carrying amount of intangible assets periodically by taking into account events or circumstances that may warrant revised estimates of useful life or that indicate the asset may be impaired. We conducted an impairment analysis for long lived assets, including the license and supply agreements for the active pharmaceutical ingredient cytisinicline, and concluded that there were no indicators of impairment identified as of December 31, 2021.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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