Stock-based Compensation (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
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| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 1,909 | $ 2,132 | $ 3,963 | $ 4,496 |
| Research and development | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | 1,056 | 1,189 | 2,216 | 2,503 |
| General and administrative | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 853 | $ 943 | $ 1,747 | $ 1,993 |
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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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