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Fair Value Measurements - Additional Information (Detail) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value assets, Level 1 to Level 2 transfers $ 0 $ 0
Fair value assets, Level 2 to Level 1 transfers 0 0
Fair value liabilities, Level 1 to Level 2 transfers 0 0
Fair value liabilities, Level 2 to Level 1 transfers 0 0
Fair value assets, transfers into Level 3 0 0
Fair value assets, transfers out of Level 3 0 0
Fair value liabilities, transfers into Level 3 0 0
Fair value liabilities, transfers out of Level 3 $ 0 $ 0
Pharma Essentia | OTC | Taiwan | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Number of shares owned by company 68,000 68,000