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Stock Based Compensation (Details 4) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Employee stock options |  |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |  |
Expected term (years) | 6 years 4 months 24 days | 6 years | 6 years 1 month 6 days | 6 years
Expected volatility (as a percent) | 86.50% | 77.40% | 76.60% | 77.40%
Risk-free interest rate (as a percent) | 1.95% | 2.02% | 1.62% | 2.02%
Total unrecognized compensation expense, net of estimated forfeitures | $ 11.3 |  | $ 11.3 |
Period to recognize total unrecognized compensation expense |  |  | 3 years |
Employee Stock Purchase Plan |  |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |  |
Expected volatility (as a percent) |  | 70.60% |  | 70.60%
Employee Stock Purchase Plan | Minimum |  |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |  |
Expected term (years) | 6 months | 6 months | 6 months | 6 months
Expected volatility (as a percent) | 70.60% |  | 70.60% |
Risk-free interest rate (as a percent) | 0.06% | 0.06% | 0.06% | 0.06%
Employee Stock Purchase Plan | Maximum |  |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |  |
Expected term (years) | 2 years | 2 years | 2 years | 2 years
Expected volatility (as a percent) | 82.90% |  | 82.90% |
Risk-free interest rate (as a percent) | 0.46% | 0.46% | 0.46% | 0.46%

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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