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Intangible assets and goodwill (Tables)
12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Future amortization expense The estimated future amortization of the Emflaza rights, Waylivra, and Tegsedi intangible assets is expected to be as follows:
 
 
As of December 31, 2019
2020
 
$
31,139

2021
 
31,139

2022
 
31,139

2023
 
31,139

2024 and thereafter
 
9,444

Total
 
$
134,000