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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
Intangible Assets and Goodwill |
Schedule of intangible assets, net | The components of intangible assets were as follows (in thousands, except for useful life):
|  |  |  | Balance at December 31, 2018 |  | Balance at December 31, 2017
|  | 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 |  | $ | 55,636 |  | $ | 215,364 |  | $ | 271,000 |  | $ | 34,099 |  | $ | 236,901
Schedule of estimated aggregate amortization expense | 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):
|  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | Thereafter
Amortization expense | $ | 21,536 |  | $ | 21,536 |  | $ | 21,536 |  | $ | 21,536 |  | $ | 21,536 |  | $ | 107,684

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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