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Intangible Assets - Summary of Future Intangible Asset Amortization (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 21,929 $ 23,037
HETLIOZ®    
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount 21,929 $ 23,037
2020 370  
2021 1,478  
2022 1,478  
2023 1,478  
2024 1,478  
Thereafter $ 15,647