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Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($)		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 12, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase, authorized		$ 0
2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock available for grants of awards		1,731,800
Number of shares available for grant annual increase	1,066,403
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense, net		$ 600,000	$ 2,500,000
Stock Options, unrecognized share-based compensation expense		$ 1,500,000
Share-based compensation expense not yet recognized, weighted-average period for recognition		9 months 18 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense, net		$ 1,000,000.0	1,000,000.0
Share-based compensation expense not yet recognized, weighted-average period for recognition		2 years 7 months 6 days
Unamortized share-based compensation expense		$ 8,600,000
Performance Stock Units (PSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense, net		$ 500,000	$ 400,000
Share-based compensation expense not yet recognized, weighted-average period for recognition		2 years 4 months 24 days
Unamortized share-based compensation expense		$ 5,800,000
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase, authorized				$ 25,000,000.0

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