License and Other Agreements - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended
	Mar. 10, 2020	Oct. 22, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Research And Development Arrangement Contract To Perform For Others [Line Items]
Deferred revenue			$ 5,000		$ 5,000
License and other revenue			34	$ 4,097
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
Arctic Vision Limited | Maximum [Member]
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 [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Development milestone payments	$ 4,000
Commercial Arrangement | Bausch Health Ireland Limited | Maximum [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Pre-launch milestone payments		15,000
Additional milestone payments		$ 57,300