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Property and Equipment (Details) - Property, Plant and Equipment
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 3 years 3 years
Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 7 years 7 years