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Ownership of the entity as a percentage of voting power.

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Represents the percentage of stock awards vesting each month.

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Represents the percentage of stock awards vesting each year.

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Period from grant date that an equity-based award expires after death or termination due to disability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires after termination, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the maximum increase in share reserve on first trading day as percentage of total number of outstanding shares of common stock on last trading day under the terms of the Plan.

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Represents threshold limit to issue or transfer authorized shares under the terms of the Plan.

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Period of specified share-based compensation award differentiated by a particular vesting feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares (or other type of equity) forfeited during the period in connection with bonus plan.

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No definition available.

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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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Unrecognized cost of unvested share-based compensation awards.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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.

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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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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.

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

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No definition available.

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Stock-Based Compensation - Plans (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	12 Months Ended
	Oct. 04, 2016	Sep. 28, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Aug. 31, 2016	Sep. 28, 2014
Stock-Based Compensation
Stock-based compensation expense (in dollars)				$ 4,250	$ 565	$ 254
Stock options
Stock-Based Compensation
Vesting period				4 years
Stock-based compensation expense (in dollars)				$ 721	$ 565	$ 254
Stock options \| Vesting, Tranche 1
Stock-Based Compensation
Vesting period				1 year
Vesting (as a percent)				25.00%
Stock options \| Vesting, Tranche 2
Stock-Based Compensation
Period of monthly vesting				36 months
Monthly vesting (as a percent)				2.08%
Stock options \| Employee owning more than 10% of voting power
Stock-Based Compensation
Expiration term				5 years
Expiration term after termination				90 days
Expiration term after death or termination due to disability				1 year
Stock options \| Minimum \| Employee owning more than 10% of voting power
Stock-Based Compensation
Ownership (as a percent)			10.00%	10.00%
Option price as percentage of fair market value of common stock on the date of grant				110.00%
2014 Plan
Stock-Based Compensation
Authorized shares of common stock								3,935,865	4,037,981
Awards, other than options, granted (in shares)			0
Options granted (in shares)			0
2014 Plan \| Restricted stock
Stock-Based Compensation
Awards, other than options, granted (in shares)		700,386
Share price (in dollars per share)		$ 12.00
Stock-based compensation expense (in dollars)				$ 3,246
Unrecognized compensation expense (in dollars)			$ 5,159	$ 5,159
2016 Plan
Stock-Based Compensation
Options granted (in shares)				479,010	365,098	259,928
Threshold limit to issue or transfer authorized shares (in shares)		800,000
Automatic increase on share reserve (as a percent)		5.00%
Available for future grant (in shares)			296,028	296,028
2016 Plan \| Restricted stock
Stock-Based Compensation
Awards, other than options, granted (in shares)		22,260
Share price (in dollars per share)		$ 12.00
Stock-based compensation expense (in dollars)				$ 39
Unrecognized compensation expense (in dollars)			$ 228	$ 228
2016 Plan \| Restricted Stock, Initial grant
Stock-Based Compensation
Vesting period		3 years
Annual vesting (as a percent)		33.33%
2016 Plan \| Restricted Stock, Annual grant \| Maximum
Stock-Based Compensation
Vesting period		1 year
2016 Plan \| Stock options
Stock-Based Compensation
Expiration term				10 years
Unrecognized compensation expense (in dollars)			$ 4,221	$ 4,221
2016 Plan \| Class A
Stock-Based Compensation
Authorized shares of common stock							2,702,443
2016 Plan \| Class B
Stock-Based Compensation
Authorized shares of common stock							1,335,538
Leadership Exit Bonus Plan and Equity Compensation Plan 2016
Stock-Based Compensation
Share price (in dollars per share)	$ 12.00
Surrender of common stock (in shares)	20,372
Issuance of common stock (in shares)	13,362
Shares paid for tax withholding (in shares)	7,010
Issuance of common stock (in dollars)	$ 244