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Share-Based Compensation - Schedule of restricted stock and RSU activity (Details) - $ / shares | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | Oct. 31, 2018 | Jun. 29, 2019 | Dec. 31, 2018
Restricted stock unit |  |  |  |
Number of Shares of Restricted Stock |  |  |  |
Outstanding, beginning balance (in shares) |  |  | 0 |
Granted (in shares) |  |  | 70,360 |
Outstanding, ending balance (in shares) |  |  | 70,360 | 0
Restricted Stock Activity, Additional Disclosures |  |  |  |
Weighted Average Grant Date Fair Value Per Share (in dollars per share) |  |  | $ 168.10 | $ 0
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) |  |  | $ 168.10 |
Restricted stock |  |  |  |
Number of Shares of Restricted Stock |  |  |  |
Outstanding, beginning balance (in shares) |  |  | 100,127 |
Granted (in shares) | 99,433 | 135,791 | 99,433 |
Vested/Released (in shares) |  |  | (35,667) |
Outstanding, ending balance (in shares) |  |  | 163,893 | 100,127
Restricted Stock Activity, Additional Disclosures |  |  |  |
Weighted Average Remaining Contractual Life (Years) |  |  | 1 year 9 months 18 days | 1 year 7 months 6 days
Weighted Average Grant Date Fair Value Per Share (in dollars per share) |  | $ 17.03 | $ 19.46 | $ 17.03
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ 20.02 |  | $ 20.02 |

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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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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 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. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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