License and Other Agreements - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended			9 Months Ended
	Mar. 10, 2020	Oct. 22, 2019	Oct. 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Research And Development Arrangement Contract To Perform For Others [Line Items]
Pre-launch milestone payments							$ 10,000
Deferred revenue					$ 5,000		5,000		$ 5,000
License and other revenue					3,074	$ 3,432	3,888	$ 7,883
Bausch Health Ireland Limited
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront payment		$ 5,000
First cumulative net sales of products			$ 45,000
Bausch Health Ireland Limited | Upfront Payment
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront payment	$ 4,000
Deferred revenue					5,000		5,000		$ 5,000
Milestone Payments Received			5,000
Bausch Health Ireland Limited | Forecast | Upfront Payment
Research And Development Arrangement Contract To Perform For Others [Line Items]
License and other revenue				$ 5,000
Arctic Vision Limited | Maximum
Research And Development Arrangement Contract To Perform For Others [Line Items]
Development milestone payments	$ 31,500
Threshold percentage of sales for tiered royalties	12.00%
Arctic Vision Limited | Minimum
Research And Development Arrangement Contract To Perform For Others [Line Items]
Threshold percentage of sales for tiered royalties	10.00%
XIPERE [Member] | Arctic Vision Limited | Maximum
Research And Development Arrangement Contract To Perform For Others [Line Items]
Development milestone payments	$ 4,000
Commercial Arrangement | Bausch Health Ireland Limited
Research And Development Arrangement Contract To Perform For Others [Line Items]
Pre-launch milestone payments			10,000
Commercial Arrangement | Bausch Health Ireland Limited | Maximum
Research And Development Arrangement Contract To Perform For Others [Line Items]
Additional milestone payments			$ 55,000
License Arrangement | Arctic Vision Limited
Research And Development Arrangement Contract To Perform For Others [Line Items]
Additional fees for expansion to existing license					$ 3,000		$ 3,000