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Intangible Assets - Summary of Future Intangible Asset Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 24,542 $ 26,069
HETLIOZ®    
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount 24,542 $ 26,069
2019 1,518  
2020 1,518  
2021 1,518  
2022 1,518  
2023 1,518  
Thereafter $ 16,952