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Share-Based Compensation - Narrative (Details) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 93 Months Ended | 99 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 | Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Jun. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,488,032 |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 36.14 |  |  |  |
Stock options outstanding (in shares) |  |  |  |  |  |  |  |  |  | 6,245,103 |  | 6,245,103 |  | 5,120,293 | 5,120,293 | 6,245,103
2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  | 14,482,356 |  |  |  |  | 14,482,356 |  |  |  |  |  |  |  |
Stock options outstanding (in shares) |  |  |  |  |  |  |  |  |  | 6,245,103 |  | 6,245,103 |  | 5,120,293 | 5,120,293 | 6,245,103
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,335,331 | 4,705,766
Shares available for grant (in shares) |  |  |  |  |  |  |  |  |  | 3,437,794 |  | 3,437,794 |  | 6,859 | 6,859 | 3,437,794
Beginning 2020 fiscal year | 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares authorized annually (in shares) |  |  | 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 |  |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 500,000 | $ 1,800,000 | $ 700,000 |  |  |
Unrecognized compensation expense |  |  |  |  |  |  |  |  |  | $ 9,500,000 |  | $ 9,500,000 |  | $ 2,400,000 | $ 2,400,000 | $ 9,500,000
Unrecognized compensation expense, period of recognition |  |  |  |  |  |  |  |  |  |  |  | 3 years 6 months |  | 2 years 10 months 24 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 | $ 19.46 |  | $ 19.46 |  | $ 17.03 | $ 17.03 | $ 19.46
Shares issued (in shares) |  |  |  |  |  |  |  |  |  | 163,893 |  | 163,893 |  | 100,127 | 100,127 | 163,893
Vesting period |  |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 500,000 | 0 | $ 800,000 | 0 |  |  |
Unrecognized share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  | $ 3,000,000.0 |  |  |  | $ 3,000,000.0
Unrecognized compensation expense, period of recognition |  |  |  |  |  |  |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) |  |  |  |  |  |  |  | $ 20.02 |  |  |  | $ 20.02 |  |  |  |
Shares of restricted stock purchased by nonemployees (in shares) |  |  |  |  |  |  |  |  |  | 140,560 |  | 140,560 |  |  |  | 140,560
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) |  |  |  |  |  |  |  |  |  |  |  | 70,360 |  |  |  |
Fair value per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 168.10 |  | $ 168.10 |  | $ 0 | $ 0 | $ 168.10
Shares issued (in shares) |  |  |  |  |  |  |  |  |  | 70,360 |  | 70,360 |  | 0 | 0 | 70,360
Share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 89,000 | $ 0 | $ 89,000 | $ 0 |  |  |
Unrecognized share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  | $ 2,900,000 |  | $ 0 | $ 0 | $ 2,900,000
Unrecognized compensation expense, period of recognition |  |  |  |  |  |  |  |  |  |  |  | 3 years 10 months 24 days |  |  |  |
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 168.10 |  |  |  |
Restricted stock unit | 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  | 70,360 |  | 70,360 |  | 0 | 0 | 70,360
Employee Stock | 2018 ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  |  |  | 804,195 |  |  |  |  |  |  |  |  |
Additional shares authorized annually (in shares) |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |
Executive Officer | Employee | 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) | 125,000 | 50,000 |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 168.10 | $ 25.00 |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |

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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. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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. + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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. + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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