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Intangible assets and goodwill (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Future amortization expense | The estimated future amortization of the Emflaza rights intangible asset is expected to be as follows:
|  | As of March 31, 2019
2019 |  | $ | 18,207 |
2020 |  | 24,277 |
2021 |  | 24,277 |
2022 |  | 24,276 |
2023 and thereafter |  | 27,418 |
Total |  | $ | 118,455 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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