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Stock-based Compensation (Details) (USD $)
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3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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| Stock-based compensation expense related to stock-based awards | ||
| Total stock-based compensation expense | $ 2,054,000us-gaap_AllocatedShareBasedCompensationExpense | $ 2,364,000us-gaap_AllocatedShareBasedCompensationExpense |
| Research and development | ||
| Stock-based compensation expense related to stock-based awards | ||
| Total stock-based compensation expense |
1,160,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember |
1,314,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember |
| General and administrative | ||
| Stock-based compensation expense related to stock-based awards | ||
| Total stock-based compensation expense |
$ 894,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember |
$ 1,050,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember |
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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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