Share-Based Compensation - Schedule of stock option activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 29, 2019	Dec. 31, 2018
Number of Stock Options
Outstanding, beginning balance (in shares)	5,120,293
Granted (in shares)	1,488,032
Exercised (in shares)	(294,335)
Cancelled/Forfeited (in shares)	(68,887)
Outstanding, ending balance (in shares)	6,245,103	5,120,293
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 3.13
Granted (in dollars per share)	36.14
Exercised (in dollars per share)	1.81
Cancelled/Forfeited (in shares)	7.02
Outstanding, ending balance (in dollars per share)	$ 11.01	$ 3.13
Aggregate Intrinsic Value
Outstanding at December 31, 2018	$ 81,371
Granted	$ 0
Exercised	$ 7,328
Cancelled/Forfeited	$ 0
Outstanding at June 29, 2019	$ 935,616	$ 81,371
Stock Option Activity, Additional Disclosures
Weighted average remaining contractual life, outstanding	7 years 6 months	7 years 3 months 18 days
Weighted average remaining contractual life, vested and exercisable	5 years 9 months 18 days
Weighted average remaining contractual life, vested and expected to vest	6 years 8 months 12 days
Vested and exercisable (in shares)	3,091,340
Vested and expected to vest (in shares)	4,419,185
Vested and exercisable (in dollars per share)	$ 1.26
Vested and expected to vest (in dollars per share)	$ 5.48
Aggregate intrinsic value, vested and exercisable	$ 492,807
Aggregate intrinsic value, vested and expected to vest	$ 686,118

Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Intrinsic Value

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed.

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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