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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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