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Stock Based Compensation - Stock option activity (Details) - Stock options - $ / shares
1 Months Ended 11 Months Ended 12 Months Ended
Feb. 28, 2017
Jan. 31, 2017
Dec. 31, 2016
May 31, 2016
Dec. 12, 2018
Dec. 31, 2017
Shares            
Outstanding at the beginning of the period (in shares)         1,332,632  
Granted (in shares) 80,833 80,833 20,000 1,243,299 76,559  
Outstanding at the end of the period (in shares)         1,409,191 1,332,632
Exercisable at the end of the period (in shares)         1,362,969  
Vested or expected to vest at the end of the period (in shares)       9,800 1,409,191  
Weighted-Average Exercise Price (actual per share price)            
Outstanding at the beginning of the period (in dollars per share)         $ 2.25  
Granted (in dollars per share) $ 2.25 $ 2.25 $ 2.25 $ 2.25 1.00  
Outstanding at the end of the period (in dollars per share)         2.18 $ 2.25
Exercisable at the end of the period (in dollars per share)         2.18  
Vested or expected to vest at the end of the period (in dollars per share)         $ 2.18  
Weighted-Average Remaining Contractual Term            
Outstanding         7 years 6 months 8 years 6 months
Granted         7 years 6 months  
Exercisable at the end of the period         7 years 6 months  
Vested or expected to vest at the end of the period         7 years 6 months