Borrowings - Milestone Rights - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Remaining milestone rights liability	$ 7,300	$ 7,300
Payment for milestone liability	5,000
Milestone Rights liability — current	1,337
Milestone rights liability	$ 5,926	$ 7,263