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Intangible assets and goodwill | 9 Months Ended
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Sep. 30, 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 September 30, 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 | ​ | $ | 71,788 | ​ | $ | 199,212 | ​ | $ | 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 | $ | 5,387 | ​ | $ | 21,536 | ​ | $ | 21,536 | ​ | $ | 21,536 | ​ | $ | 21,536 | ​ | $ | 107,681
​ Goodwill There were no changes to the carrying amount of goodwill for the nine months ended September 30, 2019.

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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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