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

No definition available.

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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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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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-Name Accounting Standards Codification
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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.

+ References

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- Definition

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

+ References

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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).

+ References

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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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- Definition

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

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

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

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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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

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

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- Definition

Number of shares issued under share-based payment arrangement.

+ References

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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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- Definition

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		9 Months Ended		93 Months Ended	102 Months Ended
	Aug. 01, 2019	Jun. 10, 2019	May 01, 2019	Apr. 30, 2019	Apr. 29, 2019	Apr. 18, 2019	Apr. 03, 2019	Nov. 15, 2018	Apr. 30, 2019	Oct. 31, 2018	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 31, 2018	Sep. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)													1,493,105
Exercise price (in dollars per share)													$ 36.61
Stock options outstanding (in shares)											6,087,169		6,087,169		5,120,293	6,087,169
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance				14,482,356					14,482,356
Stock options outstanding (in shares)											6,087,169		6,087,169		5,120,293	6,087,169
Shares issued (in shares)															4,335,331	4,854,085
Shares available for grant (in shares)											3,455,930		3,455,930		6,859	3,455,930
Beginning 2020 Fiscal Year \| 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized annually				2,144,521
Percent of common stock outstanding, per year				4.00%
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense											$ 2,000,000.0	$ 300,000	$ 3,800,000	$ 1,000,000.0
Unrecognized compensation expense											$ 9,800,000		$ 9,800,000			$ 9,800,000
Unrecognized compensation expense, period of recognition													3 years 3 months 18 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)									99,433	135,791			99,433
Purchase price (in dollars per share)				$ 0.01					$ 0.01	$ 0.02
Fair value per share (in dollars per share)										$ 17.03	$ 19.49		$ 19.49		$ 17.03	$ 19.49
Shares issued (in shares)											113,601		113,601		100,127	113,601
Share-based compensation expense											$ 500,000	0	$ 1,300,000	0
Unrecognized compensation expense, period of recognition													1 year 6 months
Vesting period				24 months
Unrecognized share-based compensation expense											$ 2,500,000		$ 2,500,000			$ 2,500,000
Restricted stock price (in dollars per share)									$ 20.02				$ 20.02
Shares of restricted stock purchased by nonemployees (in shares)											113,601		113,601			113,601
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
Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)													85,222
Fair value per share (in dollars per share)											$ 169.49		$ 169.49		$ 0	$ 169.49
Shares issued (in shares)											85,121		85,121		0	85,121
Share-based compensation expense											$ 600,000	$ 0	$ 700,000	$ 0
Unrecognized compensation expense, period of recognition													3 years 7 months 6 days
Unrecognized share-based compensation expense											$ 3,800,000		$ 3,800,000			$ 3,800,000
Restricted stock price (in dollars per share)													$ 169.48
Restricted Stock Unit \| 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	14,862
Fair value per share (in dollars per share)	$ 176.04
Shares issued (in shares)											85,121		85,121		0	85,121
Employee Stock \| 2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance								804,195
Additional shares authorized annually								536,130
Percent of common stock outstanding, per year								1.00%
Period of additional shares authorized								10 years
Employee \| 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)					48,999		264,033
Exercise price (in dollars per share)					$ 25.00		$ 20.02
Employee \| Restricted Stock Unit \| 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		70,360
Fair value per share (in dollars per share)		$ 168.10
Nonemployee \| Restricted Stock \| 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						99,433
Purchase price (in dollars per share)						$ 0.01
Nonemployee \| Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	12 months
Executive Officer \| Employee \| 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	5,073	125,000	50,000			1,000,000
Exercise price (in dollars per share)	$ 176.04	$ 168.10	$ 25.00			$ 25.00
Executive Officer \| Employee \| Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	48 months
Executive Officer \| Employee \| Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
First Anniversary \| Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage													25.00%
First Anniversary \| Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage													25.00%
Thereafter \| Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period													3 years
Thereafter \| Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period													3 years