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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Total net sales	$ 73,240	$ 74,710	$ 78,093	$ 67,968	$ 73,234	$ 64,831	$ 31,558	$ 55,336	$ 294,011	$ 224,959	$ 236,984
United States
Revenues
Total net sales									223,791	173,086	192,456
International
Revenues
Total net sales									70,220	51,873	44,528
Glaucoma
Revenues
Total net sales									231,977	179,363	230,967
Glaucoma | United States
Revenues
Total net sales									170,796	133,719	187,650
Glaucoma | International
Revenues
Total net sales									61,181	45,644	43,317
Corneal Health
Revenues
Total net sales									62,034	45,596	6,017
Corneal Health | United States
Revenues
Total net sales									52,995	39,367	4,806
Corneal Health | International
Revenues
Total net sales									$ 9,039	$ 6,229	$ 1,211

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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