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Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Increase In Number of Shares Available for Issuance, Percentage

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Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Issued, Number

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cost capitalized for award under share-based payment arrangement.

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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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Amount of cost to be recognized for option under share-based payment arrangement.

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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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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jul. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Options outstanding (in shares)		12,642,503		12,642,503			11,260,788
Capitalized stock-based compensation expense		$ 0.3	$ 0.2	$ 0.5	$ 0.4
2018 Stock Option and Incentive Plan
Class of Stock [Line Items]
Annual cumulative increase in the number of shares reserved and available for issuance	5.00%
Options issued (in shares)		6,637,862		6,637,862
Options outstanding (in shares)		6,637,862		6,637,862
2010 Stock Option Plan
Class of Stock [Line Items]
Options issued (in shares)		6,004,641		6,004,641
Options outstanding (in shares)		6,004,641		6,004,641
Stock Options
Class of Stock [Line Items]
Compensation expense not yet recognized		$ 24.0		$ 24.0
Weighted-average recognition period for unrecognized stock-based compensation				2 years 4 months 24 days
Weighted-average fair value of stock options granted (in dollars per share)				$ 7.13
Stock Options \| 2004 Plan, 2010 Plan and 2018 Plan
Class of Stock [Line Items]
Vesting period				4 years
Expiration period				10 years
Performance Stock Unit \| Minimum
Class of Stock [Line Items]
Performance targets, eligible issuance of shares						0.00%
Performance Stock Unit \| Maximum
Class of Stock [Line Items]
Performance targets, eligible issuance of shares						200.00%
RSUs and PSUs
Class of Stock [Line Items]
Weighted-average recognition period for unrecognized stock-based compensation				3 years 1 month 6 days
Total unrecognized stock-based compensation		$ 98.4		$ 98.4
Class A Common Stock \| 2018 Stock Option and Incentive Plan
Class of Stock [Line Items]
Common stock reserved for future issuance (in shares)		5,365,832		5,365,832