Stock-Based Payments - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
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| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | $ 2,356 | $ 1,744 | $ 4,234 | $ 3,440 |
| Research and development | ||||
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | 918 | 670 | 1,615 | 1,235 |
| General and administrative | ||||
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | $ 1,438 | $ 1,074 | $ 2,619 | $ 2,205 |
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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