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Intangible assets and goodwill | 3 Months Ended
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Mar. 31, 2019
Intangible assets and goodwill |
Intangible assets and goodwill | 8. Intangible assets and goodwill Intangible Assets, Net The components of intangible assets were as follows (in thousands, except for useful life):
|  |  |  | Balance at March 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 |  | $ | 61,020 |  | $ | 209,980 |  | $ | 271,000 |  | $ | 55,636 |  | $ | 215,364
Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets is as follows (in thousands):
|  | Remainder of |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | Thereafter
Amortization expense | $ | 16,155 |  | $ | 21,536 |  | $ | 21,536 |  | $ | 21,536 |  | $ | 21,536 |  | $ | 107,681
Goodwill There were no changes to the carrying amount of goodwill for the three months ended March 31, 2019.

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- References No definition available. + Details
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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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