Stockholders' Equity (Deficit) (Schedule of Stock-based Compensation) (Details) - USD ($) |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Stock based compensation | $ 1,046,086 | $ 722,358 | $ 1,066,443 | $ 571,924 | ||
| Outstanding stock options [Member] | ||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Stock based compensation | $ 245,289 | $ 224,586 | $ 942,136 | $ 722,358 | 570,760 | 131,178 |
| Non-employee stock options [Member] | ||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Stock based compensation | $ 495,683 | 415,212 | ||||
| Restricted stock awards [Member] | ||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Stock based compensation | $ 25,534 | |||||