Revenue - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Revenues	$ 7,489	$ 2,012
YUTIQ [Member]
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Revenues	3,575	543
DEXYCU [Member]
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Revenues	1,112	684
Product [Member]
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Revenues	$ 4,687	$ 1,227