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Stockholders' Equity - Summary of Capital Structure (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Class Of Stock [Line Items]    
Shares authorized 50,000,000 50,000,000
Shares issued 27,053,999 20,912,396
Treasury shares 104,063 91,951
Shares outstanding 26,949,936 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
Shares outstanding   45,500
Par value per share $ 0.01 $ 0.01
Liquidation preference per share $ 100 $ 100
Liquidation preference amount   $ 4,550
Series B Preferred Dividends    
Class Of Stock [Line Items]    
Shares authorized 115,000 115,000
Shares issued   51,076
Shares outstanding   51,076
Par value per share $ 0.01 $ 0.01
Liquidation preference per share $ 100 $ 100
Liquidation preference amount   $ 5,108