Government Grant - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 30, 2016	Sep. 30, 2016	Sep. 30, 2016
Government Grants [Abstract]
Orphan products development grant	$ 500,000
Grant revenue		$ 120,000	$ 295,000
Amount of grant receivable		$ 120,000	$ 120,000