Stock Incentive Plans - Schedule of Weighted Average Assumptions for Unvested Non Employee Stock Options (Details) - Non-employee stock options |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Share-based Goods and Nonemployee Services Transaction [Line Items] | |||
| Risk‑free interest rate | 2.06% | 1.57% | 1.22% |
| Expected dividend yield (as a percent) | 0.00% | 0.00% | 0.00% |
| Expected life | 8 years 9 months 18 days | 6 years 5 months 16 days | 5 years 10 months 13 days |
| Expected volatility (as a percent) | 87.33% | 98.18% | 98.25% |
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the expected term of a nonvested share or option award issued to other than an employee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Period an equity-based award is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The estimated measure of the percentage amount by which a share price is expected to fluctuate during the expected term of a nonvested share or option award issued to other than an employee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The risk-free interest rate assumption that is used in valuing a nonvested share or option award issued to other than an employee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|