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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - Stock Options | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Employees and Directors |  |  |
Summary of assumptions used to estimate the fair value of stock options |  |  |
Risk-free interest rate | 0.91% | 0.99% | 1.47%
Expected volatility | 76.00% | 74.00% | 109.00%
Expected life in years | 5 years | 5 years | 5 years
Dividend yield | 0.00% | 0.00% | 0.00%
Forfeiture rate | 7.00% | 7.00% | 8.00%
Non Employee |  |  |
Summary of assumptions used to estimate the fair value of stock options |  |  |
Risk-free interest rate (minimum) | 2.30% | 2.10% | 1.50%
Risk-free interest rate (maximum) | 2.50% | 2.30% | 2.70%
Dividend yield | 0.00% | 0.00% | 0.00%
Non Employee | Minimum |  |  |
Summary of assumptions used to estimate the fair value of stock options |  |  |
Expected volatility | 71.00% | 105.00% | 104.00%
Expected life in years | 7 years | 7 years | 7 years
Non Employee | Maximum |  |  |
Summary of assumptions used to estimate the fair value of stock options |  |  |
Expected volatility | 104.00% | 108.00% | 115.00%
Expected life in years | 10 years | 10 years | 10 years

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- Definition Assumptions used in estimation of fair value of stock options. + References No definition available. + Details
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- Definition Forfeiture rate. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + 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 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 + Details
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