Share-based Compensation Plans - Additional Information (Details) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair values of options granted \| $ / shares	$ 1.76
Unrecognized share-based compensation expense related to stock options \| $	$ 3.0
Weighted average period of unrecognized share-based compensation expense	2 years
Unrecognized share-based compensation expense related to non-vested shares \| $	$ 2.1
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option grants, term	10-year
Weighted average period of unrecognized share-based compensation expense	2 years 4 months 24 days
Maximum \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option, vesting period	4 years
Minimum \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option, vesting period	3 years
2018 EIP \| Common Stock \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant \| shares	13,915,000
2021 Employee Stock Purchase Plan (“2021 ESPP”) \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of shares of common stock to employees \| shares	375,000

Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Description of terms of award under share-based payment arrangement.

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