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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2019
Intangible Assets and Goodwill |
Intangible Assets and Goodwill | Note 8. Intangible Assets and Goodwill Intangible Assets, Net The components of intangible assets were as follows (in thousands, except for useful life):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Balance at December 31, 2019 | ​ | Balance at December 31, 2018
​ | ​ | Weighted- | ​ | Gross | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | Net
​ | ​ | Average Useful | ​ | Carrying | ​ | Accumulated | ​ | Carrying | ​ | Carrying | ​ | Accumulated | ​ | Carrying
​ |  | Lives (Years) |  | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Finite-lived intangible assets: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Licensed IP | ​ | 12.5 | ​ | $ | 271,000 | ​ | $ | 77,172 | ​ | $ | 193,828 | ​ | $ | 271,000 | ​ | $ | 55,636 | ​ | $ | 215,364
​ Amortization expense was $21.5 million for the years ended December 31, 2019, 2018 and 2017 and is recorded in cost of product revenues on the consolidated statement of operations. Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets will be as follows for the years ending December 31 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | ​ | 2021 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​ | ​ | Thereafter
Amortization expense | $ | 21,536 | ​ | $ | 21,536 | ​ | $ | 21,536 | ​ | $ | 21,536 | ​ | $ | 21,536 | ​ | $ | 86,148
​ For the year ended December 31, 2017, we considered our previously acquired indefinite-lived in-process research and development asset to be impaired and recorded a $12.0 million impairment charge in research and development expense on the consolidated statements of operations. The impairment was due to the discontinuation of the ICLUSIG clinical study, OPTIC-2L, by ARIAD. OPTIC-2L was included in the initial fair value assumptions upon acquisition on June 1, 2016. Goodwill There were no changes to the carrying amount of goodwill for the years ended December 31, 2019 and 2018.

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- Definition The entire disclosure for goodwill and 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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