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Stock Based Compensation - Restricted Shares (Details) - Restricted shares - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Number of Restricted Stock Units    
Units outstanding at the beginning of the period (in shares)    
Vested (in shares)   9,486
Forfeited (in shares)   9,486
Units outstanding at the end of the period (in shares)   18,972
Weighted Average Grant Date Fair Value    
Compensation expense $ 143 $ (371)