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Stockholders' Equity - Summary of Capital Structure (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |
Shares authorized | 50,000,000 | 50,000,000
Shares issued | 26,383,763 | 20,912,396
Treasury shares | (104,002) | (91,951)
Shares outstanding | 26,279,761 | 20,820,445
Par value per share | $ 0.01 | $ 0.01
Series A Preferred Dividends |  |
Class Of Stock [Line Items] |  |
Shares authorized | 50,000 | 50,000
Shares issued | 45,500 | 45,500
Shares outstanding | 45,500 | 45,500
Par value per share | $ 0.01 | $ 0.01
Liquidation preference per share | $ 100 | $ 100
Liquidation preference amount | $ 4,550 | $ 4,550
Dividend rate | Prime + 2% | Prime + 2%
Dividend rate | 8.00% | 8.00%
Subsequent dividend payment dates | Quarterly | Quarterly
Convertible to common stock | Yes | Yes
Conversion period | Anytime | Anytime
Conversion ratio - preferred to common | 6.94008 | 6.94008
Series B Preferred Dividends |  |
Class Of Stock [Line Items] |  |
Shares authorized | 115,000 | 115,000
Shares issued | 51,076 | 51,076
Shares outstanding | 51,076 | 51,076
Par value per share | $ 0.01 | $ 0.01
Liquidation preference per share | $ 100 | $ 100
Liquidation preference amount | $ 5,108 | $ 5,108
Dividend rate | 8.00% | 8.00%
Subsequent dividend payment dates | Quarterly | Quarterly
Convertible to common stock | Yes | Yes
Conversion period | Anytime | Anytime
Conversion ratio - preferred to common | 6.94008 | 6.94008

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