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Significant Accounting Policies (Details 1)
Jan. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Class of stock      
Common stock, shares authorized (in shares)   25,000,000 25,000,000
Subsequent event      
Class of stock      
Fractional shares issued as a result of stock split 0    
Stock split conversion ratio 10    
Pre-Split Basis      
Class of stock      
Common stock, shares authorized (in shares)   250,000,000