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, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Anti-dilutive securities | 29,326,000 | 44,401,000 | 29,326,000 | 44,301 |
| Options to Purchase Common Stock [Member] | ||||
| Anti-dilutive securities | 23,051,000 | 43,051,000 | 23,051,000 | 43,059,000 |
| Warrants to Purchase Common Stock [Member] | ||||
| Anti-dilutive securities | 6,275,000 | 1,350,000 | 6,275,000 | 1,242,000 |