Operations - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) Product _People Case
Operations [Line Items]
Number of commercial products \| Product	2
Number of products approved \| Product	4
Cash, cash equivalents and investments in marketable securities	$ 211.6
Cost of Sales, Excluding Amortization of Acquired Intangible Assets [Member]
Operations [Line Items]
Impairment charges	1.2
Sales and Marketing Expense [Member]
Operations [Line Items]
Impairment charges	$ 0.1
YUTIQ [Member]
Operations [Line Items]
Number of new cases of blindness annually \| 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

Number of new blindness cases every year.

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- Definition

Number of people affected by posterior segment of eye in U.S. each year.

+ References

No definition available.

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- Definition

Number of products.

+ References

No definition available.

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- Definition

Number of products approved by by the United States (US) Food and Drug Administration (FDA).

+ References

No definition available.

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- Definition

Operations.

+ References

No definition available.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228

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- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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