Government Grant - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2020
Government Grant [Member]
Grant revenue		$ 0.2	$ 0.3
Accounts Receivable, Related Parties		$ 0.2	$ 0.2
U.S. Food and Drug Administration [Member]
Grant Received	$ 1.0
Grant Term	2 years