Net Loss Per Share - Schedule of Antidilutive Securities Excluded from Calculations of Net Loss Per Share (Details) - shares |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Anti-dilutive securities | 669,000 | 977,000 | 669,000 | 977,000 |
| Options to Purchase Common Stock [Member] | ||||
| Anti-dilutive securities | 426,000 | 768,000 | 426,000 | 768,000 |
| Warrants to Purchase Common Stock [Member] | ||||
| Anti-dilutive securities | 243,000 | 209,000 | 243,000 | 209,000 |