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Notes Payable (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 28, 2019
Jan. 28, 2019
Dec. 10, 2018
Dec. 06, 2018
Nov. 09, 2018
Oct. 24, 2018
Jun. 01, 2018
May 23, 2018
Mar. 19, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Convertible principal amount                   $ 3,659   $ 3,199  
VWAP percentage of common stock                 20.00%        
Gain on extinguishment of debt                   1,275 1,875
Amortization of debt discount                   1,091    
May 2018 Notes [Member]                          
Convertible principal amount               $ 840   500   400  
Notes payable               $ 700          
Maturity date of notes         Jun. 23, 2019     Mar. 23, 2019          
Debt instrument, description of event of default               Upon the occurrence of an event of default, the outstanding balance of the May 2018 Notes shall immediately increase to 120% of the outstanding balance immediately prior to the event of default and become immediately due and payable.          
June 2018 Note [Member]                          
Convertible principal amount             $ 3,600     $ 3,159   2,448  
Notes payable             $ 3,000            
Maturity date of notes     Jul. 01, 2019     May 01, 2019 Apr. 01, 2019            
Debt instrument, description of event of default             Upon the occurrence of an event of default, the outstanding balance of the June 2018 Note shall immediately increase to 120% of the outstanding balance immediately prior to the event of default and become immediately due and payable.            
Gain on extinguishment of debt     $ 1,875                    
December 2018 Note [Member]                          
Convertible principal amount       $ 598               $ 351  
Notes payable       $ 500                  
Maturity date of notes   Oct. 01, 2019   May 06, 2019                  
Debt instrument accrued interest rate       8.00%                  
VWAP percentage of common stock   70.00%                      
Fees payable to borrower   $ 527                      
May 2018 Notes [Member]                          
Maturity date of notes Jul. 15, 2019                        
VWAP percentage of common stock 70.00%                        
Fees payable to borrower $ 121