Stock-Based Compensation Expense - Additional Information (Details) - USD ($) $ in Millions				9 Months Ended	12 Months Ended
	Aug. 03, 2021	Jul. 30, 2021	Jul. 28, 2021	Sep. 30, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued (in shares)				27,324,054
Shares reserved for future issuance				6,111,841	19,278,888
Executive Officers and Non-Employee Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		640,567
The Calhoun Vision, Inc. 2015 Equity Incentive Plan and the Calhoun Vision, Inc. 2006 Stock Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic Value of Vested Options				$ 17.9	$ 26.2
Intrinsic Value of Outstanding Options				18.0	26.4
Total Cash Received from the Exercise of Stock Options				1.4	1.0
Total Fair Value Less Strike Price of Stock Options Exercised				$ 3.6	$ 2.7
Unvested at September 30, 2021				2,270,175	1,177,165
Total unrecognized expense related to unvested stock options				$ 19.7	$ 9.8
Weighted average period for recognition of expenses				3 years 1 month 6 days	2 years 10 months 24 days
2021 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock available for issuance			2,420,135
Common stock issued (in shares)			7,260,406
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum			4.00%
Total unrecognized expense related to unvested stock options				$ 9.8
Weighted average period for recognition of expenses				3 years 8 months 12 days
2021 Equity Incentive Plan | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future issuance			4,569,530
2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock available for issuance			484,027
Shares reserved for future issuance			1,452,081
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum			1.00%
2021 Employee Stock Purchase Plan | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum			85.00%
Share-based Compensation, Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation, Terms of Award				Stock option awards are generally granted with an exercise price of no less than 100% of estimated fair market value on the date of grant. Time based awards generally vest over four years as follows: one fourth of the total number of shares vest and become exercisable on the one-year anniversary; 1/48th of the total number of shares subject to the option vest and become exercisable on each monthly anniversary thereafter for the remaining three years.
Stock-Based Compensation, Vesting period				4 years
Share-based Compensation, Option [Member] | Executive Officers and Non-Employee Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		622,990
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future issuance				657,729
Unvested at September 30, 2021				657,729
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation, Vesting period		1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation, Vesting period		4 years
Restricted Stock Units (RSUs) [Member] | Non-Employee Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	40,134
Restricted Stock Units (RSUs) [Member] | Executive Officers and Non-Employee Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		17,577