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Stock Incentive Plans and Share-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 02, 2017	Aug. 27, 2015	Jun. 30, 2007	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 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				289,390	594,274	289,390	594,274	274,596	837,635
Stock Options, Outstanding, Number				4,228,957	3,226,943	4,228,957	3,226,943	3,402,481	2,419,529
Stock options granted in period						977,570	1,128,070
Weighted Average Exercise Price				$ 10.17	$ 8.57	$ 10.17	$ 8.57	$ 9.02	$ 8.16
Options, Exercised in Period						22,989	310,656
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted in period				0	905,000	977,570	1,128,070
Stock options weighted-average grant date fair value					$ 4.80	$ 6.36	$ 4.83
Share-based Compensation Expense				$ 1.4	$ 1.7	$ 3.6	$ 2.5
Weighted Average Remaining Contractual Term						7 years 7 months 7 days
Weighted Average Exercise Price				$ 10.17		$ 10.17
Aggregate Intrinsic Value				$ 60.1		$ 60.1
Options, Exercisable, Weighted Average Remaining Contractual Term						1 year
Options, Exercisable, Weighted Average Exercise Price				$ 4.33		$ 4.33
Options, Exercisable, Aggregate Intrinsic Value				$ 7.8		$ 7.8
Options, Exercised in Period				3,000	15,700	22,989	310,656
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 0.1	$ 0.1	$ 0.1	$ 1.7
Stock Options, Unrecognized Share-based Compensation Expense				$ 12.5		$ 12.5
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition						2 years 8 months 13 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		289,390		289,390
Stock Options, Outstanding, Number				3,583,282		3,583,282
Stock Options, Vested, Number						1,223,611
2015 Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense				$ 0.2		$ 1.5
Number of RSUs outstanding				70,648		70,648
Number of RSUs vested						0
Unrecognized Share-based compensation expense related to unvested RSUs				$ 0.1		$ 0.1
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				645,675		645,675
Stock Options, Vested, Number						388,040

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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 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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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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