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Intangible Assets - Schedule of Changes in Carrying Amounts of IPR&D Assets (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Indefinite-lived Intangible Assets [Line Items]    
IPR&D, Foreign currency translation adjustments $ 0  
IPR&D [Member]    
Indefinite-lived Intangible Assets [Line Items]    
IPR&D Balance, beginning of period   $ 38,245,871
IPR&D, Foreign currency translation adjustments   (376,894)
IPR&D Balance, end of period $ 37,868,977 $ 37,868,977