Borrowings - Milestone Rights - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Remaining milestone rights liability		$ 5.9	$ 7.3
Payment for milestone liability	$ 5.0
Milestone rights liability, current		$ 1.3