Loss Per Common Share (Details) - shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Common shares | |||
| Shares with anti-dilutive effect, not included in calculation of earnings per share | 5,033,156 | 3,411,270 | 1,698,569 |
| Convertible Preferred Stock | |||
| Shares with anti-dilutive effect, not included in calculation of earnings per share | 4,566,836 | 5,935,000 | 6,522,556 |