The Company had reserved shares of common stock for future issuance as follows:
| | | | | | | | | September 30, | December 31, | | | 2019 | 2018 | Outstanding stock options | | 8,536,713 |
| 7,117,002 |
| Warrants to purchase common stock | | 17,035,214 |
| 1,914,316 |
| Shares issuable upon conversion of convertible debt | | 1,635,299 |
| 1,720,224 |
| For possible future issuance under the Amended Omnibus Plan | | 1,524,708 |
| 2,230,057 |
| Total common shares reserved for future issuance | | 28,731,934 |
| 12,981,599 |
| | | | |
|