Operations and Basis of Presentation - Additional Information (Detail) $ in Thousands, Surgery in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) Product _People Case	Dec. 31, 2018 Surgery	Dec. 31, 2019 USD ($)
Operations [Line Items]
Number of products approved | Product	2
Accumulated deficit	$ 491,410		$ 465,286
Working capital	30,200
Cash and cash equivalents	$ 22,814		$ 22,214
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
DEXYCU [Member]
Operations [Line Items]
Number of cataract surgeries performed in U.S. | Surgery		3.8