Stock-Based Compensation - Narratives (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) shares	Sep. 30, 2021 USD ($) $ / shares shares
Stock-Based Compensation
Aggregate intrinsic value of outstanding options	$ 4.1	$ 4.1
Aggregate intrinsic value of exercisable options	3.5	$ 3.5
Stock Options
Stock-Based Compensation
Weighted average grant date fair value (per share) \| $ / shares		$ 8.74
Aggregate intrinsic value of exercisable options	0.2	$ 0.3
Unrecognized compensation expense	5.5	$ 5.5
Weighted average period for recognition of unrecognized expenses		2 years 7 months 6 days
Restricted stock units
Stock-Based Compensation
Vesting period		4 years
Weighted average grant date fair value (per share) \| $ / shares		$ 16.57
Unrecognized compensation expense	$ 1.8	$ 1.8
Weighted average period for recognition of unrecognized expenses		3 years 4 months 24 days
2019 Equity Incentive Plan
Stock-Based Compensation
Shares available for future issuance \| shares	886,606	886,606
Potential Common Shares Added Annually To Equity Plan Evergreen Option \| shares	432,442	432,442
Potential Common Shares Added Annually To Equity Plan Evergreen Option, Percentage Of Shares Outstanding Last Day Of Fiscal Year	4.00%	4.00%
2019 Equity Incentive Plan \| Stock Options
Stock-Based Compensation
Vesting period		4 years
Vesting term		P10Y

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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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 fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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