Operations and Basis of Presentation - Additional Information (Detail) $ in Thousands, Surgery in Millions		3 Months Ended	12 Months Ended
	Apr. 22, 2020 USD ($)	Mar. 31, 2020 USD ($) Product _People Case	Dec. 31, 2018 Surgery	Dec. 31, 2019 USD ($)
Operations [Line Items]
Number of products approved | Product		2
Accumulated deficit		$ 478,460		$ 465,286
Working capital		39,400
Cash and cash equivalents		$ 26,299		$ 22,214
Subsequent Event [Member]
Operations [Line Items]
Proceeds from PPP loan under CARES act	$ 2,000
YUTIQ [Member]
Operations [Line Items]
Number of new cases of blindness every year | 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