Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Calculations of Net Loss Per Share (Details) - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Anti-dilutive securities | 1,417,000 | 882,000 |
| Outstanding Options to Purchase Common Stock [Member] | ||
| Anti-dilutive securities | 1,200,000 | 426,000 |
| Warrants to Purchase Common Stock [Member] | ||
| Anti-dilutive securities | 217,000 | 209,000 |
| Notes Payable Convertible to Common Stock [Member] | ||
| Anti-dilutive securities | 247,000 | |