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Notes Payable - Schedule of Notes Payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 06, 2018
Jun. 01, 2018
May 23, 2018
Dec. 31, 2017
Principal $ 3,659 $ 3,199        
Discount (2,991) (1,914)        
Net 668 1,285      
May 2018 Notes [Member]            
Principal 500 400     $ 840  
Discount (350) (25)        
Net 150 375        
June 2018 Note [Member]            
Principal 3,159 2,448   $ 3,600    
Discount (2,641) (1,803)        
Net $ 518 645        
December 2018 Note [Member]            
Principal   351 $ 598      
Discount   (86)        
Net   $ 265