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Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 12, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase, authorized		$ 0		$ 0
2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Stock Available for Grants of Awards		1,267,201		1,267,201
Number of Shares Available for Grant Annual Increase	1,119,924
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		$ 800,000	$ 1,100,000	$ 4,200,000	$ 4,000,000
Stock Options, Unrecognized Share-based Compensation Expense		2,800,000		$ 2,800,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				1 year 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	1,100,000	$ 3,100,000	2,300,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				2 years 7 months 6 days
Unamortized share-based compensation expense		7,600,000		$ 7,600,000
Performance Stock Units (PSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		700,000	$ 300,000	$ 1,400,000	$ 800,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				2 years 2 months 12 days
Unamortized share-based compensation expense		$ 4,100,000		$ 4,100,000
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase, authorized						$ 25,000,000

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