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Summary of Future Intangible Asset Amortization (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 26,933 $ 27,819
HETLIOZ    
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount 26,933 $ 27,819
2017 864  
2018 1,728  
2019 1,728  
2020 1,728  
2021 1,728  
Thereafter $ 19,157