Operations - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Product _People Case	Dec. 31, 2020 USD ($)
Operations [Line Items]
Number of products approved | Product	4
Number of commercial products | Product	2
Cash and cash equivalents | $	$ 138,579	$ 44,909
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201912Member
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
YUTIQ [Member]
Operations [Line Items]
Number of new cases of blindness annually | Case	30,000
YUTIQ [Member] | Minimum [Member]
Operations [Line Items]
Number of people affected by posterior segment of eye in U.S. each year | _People	60,000
YUTIQ [Member] | Maximum [Member]
Operations [Line Items]
Number of people affected by posterior segment of eye in U.S. each year | _People	100,000