Stockholders' Equity (Details 3) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2019 |
Mar. 31, 2018 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Employee Benefits and Share-based Compensation | $ 798 | $ 1,137 |
| Research and development | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Employee Benefits and Share-based Compensation | 196 | 680 |
| General and administrative | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Employee Benefits and Share-based Compensation | $ 602 | $ 457 |
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- Definition Amount of expense for employee benefit and equity-based compensation. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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