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

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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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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- Definition

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

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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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Stock Incentive Plans and Share-Based Compensation (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Jan. 02, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		$ 1,100,000	$ 1,400,000	$ 4,000,000	$ 3,600,000
Stock Options, Unrecognized Share-based Compensation Expense		8,300,000		$ 8,300,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				2 years 2 months 12 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		1,100,000	200,000	$ 2,300,000	1,500,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				1 year 6 months
Unamortized Compensation Expense Related to Unvested Units		4,500,000		$ 4,500,000
Performance Stock Units (PSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		300,000	$ 0	$ 800,000	$ 0
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				2 years 9 months 18 days
Unamortized Compensation Expense Related to Unvested Units		$ 3,200,000		$ 3,200,000
2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Stock Avialable for Grants of Awards		1,007,154		1,007,154
Number of Shares Available for Grant Annual Increase	1,056,505
Performance Stock Units Vesting Period				2 years
2015 Plan [Member] \| Time Based Vesting [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance Stock Units Vesting Period				1 year