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Intangible assets (Tables)
6 Months Ended
Jun. 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 June 30, 2018
2018(1)
 
$
11,238

2019
 
22,477

2020
 
22,477

2021
 
22,477

2022 and thereafter
 
47,621

Total
 
$
126,290

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