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Intangible assets and goodwill (Tables)
9 Months Ended
Sep. 30, 2018
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 September 30, 2018
2018(1)
 
$
5,794

2019
 
23,172

2020
 
23,172

2021
 
23,172

2022 and thereafter
 
49,302

Total
 
$
124,612

 
(1) For the three months ended December 31, 2018.