Stock-based Compensation (Details) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2016 |
Mar. 31, 2015 |
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| Stock-based compensation expense related to stock-based awards | ||
| Total stock-based compensation expense | $ 1,438 | $ 2,054 |
| Research and development | ||
| Stock-based compensation expense related to stock-based awards | ||
| Total stock-based compensation expense | 693 | 1,160 |
| General and administrative | ||
| Stock-based compensation expense related to stock-based awards | ||
| Total stock-based compensation expense | $ 745 | $ 894 |
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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://www.xbrl.org/2003/role/presentationRef
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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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