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Stock Incentive Plans and Share-Based Compensation (Details Textual) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 02, 2017	Aug. 27, 2015	Jun. 30, 2007	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares Annual Increase						889,259	874,709
Maximum Number of Shares Authorized per One Participant				227,744	1,499,274	227,744	1,499,274	274,596	837,635
Stock Options, Outstanding, Number				4,318,603	2,337,643	4,318,603	2,337,643	3,402,481	2,419,529
Stock options granted in period						977,570	223,070
Weighted Average Exercise Price				$ 10.19	$ 8.75	$ 10.19	$ 8.75	$ 9.02	$ 8.16
Options, Exercised in Period						19,989	294,956
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted in period				130,570	63,070	977,570	223,070
Stock options weighted-average grant date fair value				$ 9.42	$ 4.99	$ 6.36	$ 4.24
Share-based Compensation Expense				$ 1,200,000	$ 500,000	$ 2,200,000	$ 900,000
Weighted Average Remaining Contractual Term						7 years 10 months 24 days
Weighted Average Exercise Price				$ 10.19		$ 10.19
Aggregate Intrinsic Value				$ 45,400,000		$ 45,400,000
Options, Exercisable, Weighted Average Remaining Contractual Term						1 year 3 months 18 days
Options, Exercisable, Weighted Average Exercise Price				$ 4.34		$ 4.34
Options, Exercisable, Aggregate Intrinsic Value				$ 6,400,000		$ 6,400,000
Options, Exercised in Period				0	135,330	19,989	294,956
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 0	$ 900,000	$ 100,000	$ 1,600,000
Stock Options, Unrecognized Share-based Compensation Expense				$ 14,300,000		$ 14,300,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition						2 years 10 months 24 days
2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Expiration Term		10 years
Number of Shares Authorized		2,250,000
Number of Shares Annual Increase	889,259	1,800,000
Plan Shares Annual Increase, Percentage		4.00%
Maximum Number of Shares Authorized per One Participant		2,000,000		227,744		227,744
Stock Options, Outstanding, Number				3,644,928		3,644,928
Stock Options, Vested, Number						870,205
2015 Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense				$ 800,000		$ 1,200,000
Number of RSUs outstanding				70,648		70,648
Number of RSUs vested						0
Unrecognized Share-based compensation expense related to unvested RSUs				$ 400,000		$ 400,000
Stock Option and Compensation Plan of 2007 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Expiration Term			10 years
Number of Shares Authorized			1,250,000
Maximum Number of Shares Authorized per One Participant				0		0
Stock Options, Outstanding, Number				673,675		673,675
Stock Options, Vested, Number						391,040

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

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

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Amount by which current fair value of underlying stock exceeds exercise price of 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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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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