Number of equity based compensation plans.

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- Definition

Share-based compensation arrangement by share-based payment award exercisable period of vested options.

+ References

No definition available.

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- Definition

Share-based compensation arrangements by share based payment award options grants in period contractual life.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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-Name Accounting Standards Codification
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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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

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.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

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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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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Stock-based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Apr. 20, 2018 shares	Apr. 19, 2018 CompensationPlan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity compensation plans \| CompensationPlan					2
Options to purchase common stock granted	1,711,881
Exercise price per share \| $ / shares	$ 18.06
Expense recognized associated with awards \| $	$ 13,370	$ 101	$ 78
Unrecognized compensation cost related to outstanding options \| $	$ 18,700
Unrecognized compensation cost expected to be recognized over a weighted-average period	2 years 3 months 10 days
Weighted average grant date fair value of options granted \| $ / shares	$ 18.06	$ 3.68	$ 0.14
Performance Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized associated with awards \| $	$ 100
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit	349,241
Unrecognized compensation cost expected to be recognized over a weighted-average period	2 years 6 months 21 days
Unrecognized compensation cost related to outstanding other than options \| $	$ 8,300
Chief Executive Officer [Member] \| Performance Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock granted		22,427
Exercise price per share \| $ / shares		$ 8.00
Restricted stock unit		22,427
Chief Executive Officer [Member] \| Time Vesting Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock granted	640,785
Exercise price per share \| $ / shares	$ 8.00
Restricted stock unit	640,785
Option vesting description	Subject to continued service through the vesting date, 1/3 of the Time-Vesting Awards will vest and become immediately exercisable on the first anniversary of the effective date, with an additional 1/12 of the Time-Vesting Awards vesting on each quarterly anniversary of the effective date
2018 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance				5,000,000
Contractual life of equity awards granted	10 years
2018 Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period of vested options	1 month
2018 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period of vested options	3 months