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Intangible assets and goodwill (Tables)
12 Months Ended
Dec. 31, 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 December 31, 2018
2019
 
$
24,283

2020
 
24,276

2021
 
24,277

2022
 
24,277

2023 and thereafter
 
27,418

Total
 
$
124,531