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Net Loss Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Net Loss Per Share  
Net Loss Per Share
    2018     2017  
Numerator:            
Net loss attributable to common stockholders   $ (19.0 )   $ (7.4 )
Denominator:                
Weighted-average common shares outstanding     26,636,250       10,424,481  
Basic and diluted net loss per share   $ (0.71 )   $ (0.71 )