Stock-Based Compensation (Summary Of Unvested Shares) (Details) - $ / shares |
9 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
| Number of options, Cancelled | (83,333) | |
| Weighted average fair value at grant date, Vested | $ 0.20 | $ 0.47 |
| Nonvested Options [Member] | ||
| Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
| Number of options, outstanding | 5,888,432 | |
| Number of options, Granted | 5,876,391 | |
| Number of options, Vested | (2,476,504) | |
| Number of options, Cancelled | (45,208) | |
| Number of options, outstanding | 9,243,111 | |
| Weighted average fair value at grant date, Unvested | $ 0.51 | |
| Weighted average fair value at grant date, Granted | 0.20 | |
| Weighted average fair value at grant date, Vested | 0.46 | |
| Weighted average fair value at grant date, Cancelled | 0.35 | |
| Weighted average fair value at grant date, Unvested | $ 0.33 | |