Allocated share based compensation expense would recognize subsequent period.

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Percentage of beneficial ownership percentage of an outside investor.

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Estimated forfeiture rate during the period.

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Stockholders Equity Note [line item]

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- Definition

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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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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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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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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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Stockholders' Equity - Additional Information (Details) - USD ($)			12 Months Ended
	Aug. 10, 2018	Jun. 14, 2018	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016	Feb. 11, 2016
Stockholders Equity Note [Line Items]
Beneficial Ownership Percentage of Investor						26.00%
Allocated Share-based Compensation Expense			$ 6,762,000	$ 3,161,000	$ 8,558,000
Weighted-average period of cost expected to recognize			2 years
Estimated forfeiture rate			11.00%
Proceeds from public offering of stock (in shares)	1,999,850
Shares issued, price per share	$ 36.309
Proceeds from public offering of stock	$ 72,150,000
General and Administrative Expense
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense			$ 2,635,000	1,487,000	3,809,000
Selling and Marketing Expense
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense			1,805,000	805,000	1,961,000
Research and Development Expense
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense			2,307,000	861,000	2,176,000
Cost of Sales
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense			$ 15,000	$ 8,000	612,000
Omnibus Equity Incentive Plan 2003
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense					6,857,000
Allocated share-based compensation expense would have been recognized					3,338,000
Omnibus Equity Incentive Plan 2003 \| General and Administrative Expense
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense					2,931,000
Omnibus Equity Incentive Plan 2003 \| Selling and Marketing Expense
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense					1,527,000
Omnibus Equity Incentive Plan 2003 \| Research and Development Expense
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense					1,838,000
Omnibus Equity Incentive Plan 2003 \| Cost of Sales
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense					561,000
Omnibus Equity Incentive Plan 2003 \| Restricted Stock And Restricted Stock Units
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense					2,288,000
Omnibus Equity Incentive Plan 2003 \| Employee Stock Option
Stockholders Equity Note [Line Items]
Allocated Share-based Compensation Expense					$ 4,569,000
Omnibus Plan
Stockholders Equity Note [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		2,235,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		15,385,000
Omnibus Plan \| Restricted Stock
Stockholders Equity Note [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			2,479,205