Net Loss Per Share (Details 1) - shares shares in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Weighted-average anti-dilutive common shares | 5,035 | 2,159 |
| Employee Stock Option [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Weighted-average anti-dilutive common shares | 2,991 | 1,913 |
| Warrants [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Weighted-average anti-dilutive common shares | 2,044 | 246 |