Share-based Payment Arrangement, Unearned Cost, Reclassification to Additional Paid in Capital

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Authorization of Additional Shares Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Purchase Price Per Share

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unvested, Purchased

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized per Year

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum per Year

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- Definition

Share-based Payment Arrangement, Liability, Current

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- Definition

Share-based Payment Arrangement, Unearned Cost

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No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

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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- Definition

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

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- Definition

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

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- Definition

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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- Definition

The number of grants made 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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- Definition

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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

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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No definition available.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

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

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Share-Based Compensation - Narrative (Details) - USD ($)				1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2019	Aug. 01, 2019	Apr. 30, 2019	Oct. 31, 2018	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2021	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)					4,218,278	4,218,278	5,170,976	5,120,293		4,207,029
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, unvested (in shares)					275,989	275,989	149,004	0
Share-based compensation expense						$ 9,800,000	$ 3,700,000	$ 0
Unrecognized compensation expense, period of recognition						1 year 9 months 18 days
Unrecognized share-based compensation expense					$ 14,900,000	$ 14,900,000
Vested (in shares)						99,970	23,552
Granted (in shares)						244,752	173,196
Restricted stock price (in dollars per share)						$ 109.61	$ 126.29
Fair value per share (in dollars per share)					$ 114.99	$ 114.99	$ 132.73	$ 0
Restricted stock units \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						4 years	4 years
Restricted stock units \| Nonemployee \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						12 months
Restricted stock units \| First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage						25.00%	25.00%
Restricted stock units \| Thereafter
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period								10 years
Share-based compensation expense						$ 13,100,000	$ 6,300,000	$ 1,500,000
Unrecognized compensation expense					$ 16,400,000	$ 16,400,000
Unrecognized compensation expense, period of recognition						2 years
Employee Stock Options \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						48 months
Employee Stock Options \| Employee \| Executive Chair
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	24 months	48 months
Employee Stock Options \| First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage						25.00%	25.00%
Employee Stock Options \| Thereafter
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years	3 years
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, period of recognition							8 months 12 days
Unrecognized share-based compensation expense							$ 2,500,000
Share-based compensation expense accrued, not issued						$ 3,000,000.0	1,000,000.0
Share-based compensation expense accrued, amount reclassified to APIC						3,000,000.0
Share-based compensation liability					$ 1,000,000.0	$ 1,000,000.0	$ 1,000,000.0
Vested (in shares)					23,666
Fair value of shares vested					$ 3,000,000.0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, unvested (in shares)					12,184	12,184	88,988	100,127		0
Vesting period			24 months
Share-based compensation expense						$ 1,400,000	$ 1,800,000	$ 700,000
Unrecognized share-based compensation expense					$ 200,000	$ 200,000
Vested (in shares)						76,804	87,239	35,664
Granted (in shares)				135,791		0	99,433	135,791
Restricted stock price (in dollars per share)						$ 0	$ 20.02	$ 17.03
Purchase price (in dollars per share)			$ 0.01	$ 0.02
Fair value per share (in dollars per share)				$ 17.03	$ 20.02	$ 20.02	$ 19.49	$ 17.03		$ 0
Shares of restricted stock purchased by nonemployees (in shares)					12,184	12,184
Weighted average remaining contractual life						3 months 18 days	1 year 2 months 12 days	1 year 7 months 6 days
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				12 months
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				24 months
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)					16,626,877	16,626,877
Additional shares authorized annually (in shares)						2,144,521
Percent of common stock outstanding, per year						4.00%
Shares issued (in shares)						7,127,079	5,864,738
2018 Plan \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)									18,771,398
2018 Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, unvested (in shares)					275,989	275,989
2018 ESPP \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)					1,340,325	1,340,325
Additional shares authorized annually (in shares)						536,130
Percent of common stock outstanding, per year						1.00%
Period of additional shares authorized						10 years
2018 ESPP \| Employee Stock \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)									1,876,455