Revenue - Disaggregation of Revenue (Parenthetical) (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Total revenues		$ 7,323,000	$ 7,489,000
YUTIQ [Member]
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Total revenues	[1]	3,029,000	3,575,000
YUTIQ [Member] | Ocumension Therapeutics [Member]
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Total revenues		5,000	0
DEXYCU [Member]
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Total revenues	[2]	3,773,000	1,112,000
DEXYCU [Member] | Ocumension Therapeutics [Member]
Disclosure of Product Revenue Reserves and Allowances [Line Items]
Total revenues		$ 0	$ 0

[1] Included approximately $5,000 and $0 of revenue from YUTIQ product sales to Ocumension for the three months ended March 31, 2021 and 2020, respectively.

[2] No revenue was recognized from DEXYCU product sales to Ocumension for the three months ended March 31, 2021 and 2020.