Stock-based Compensation (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
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| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 1,815 | $ 2,080 | $ 5,778 | $ 6,576 |
| Research and development | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | 966 | 1,151 | 3,182 | 3,654 |
| General and administrative | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 849 | $ 929 | $ 2,596 | $ 2,922 |
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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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