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Fair Value Measurements - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
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 | Taiwan OTC Exchange (TWO) | Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Number of shares owned by company 68,000