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Commitments and Contingencies (Details Narrative) (10 K)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Aug. 14, 2018
USD ($)
shares
Aug. 01, 2018
shares
Jul. 11, 2018
USD ($)
Jun. 20, 2018
shares
Apr. 02, 2018
USD ($)
shares
Mar. 08, 2018
USD ($)
shares
Mar. 01, 2018
shares
Feb. 28, 2018
USD ($)
Feb. 13, 2018
USD ($)
Integer
Nov. 30, 2017
shares
Oct. 12, 2017
USD ($)
Integer
shares
Sep. 30, 2017
shares
Aug. 31, 2017
shares
May 18, 2017
shares
Aug. 09, 2016
USD ($)
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Nov. 02, 2017
$ / shares
May 02, 2017
$ / shares
Operating Leases Commitments And Security Deposit [Line Items]                                          
Monthly rent                               $ 20 $ 17 $ 77 $ 110    
Stock issued during period shares | shares       750,000           88,700 347,400 220,000 220,000 200,000   43,100,000          
Warrants Initial exercise price | $ / shares                                       $ 0.75 $ 0.50
Inducement expense                                   20,312    
Mr. Robert Lowrey [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Number of restricted common stock issued | shares   250,000         750,000                            
Stock option vesting period   17 months         24 months                            
Series F Warrant [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Number of warrant to purchase of common stock shares | shares                                   436,100      
Warrants Initial exercise price | $ / shares                                   $ 2.00      
Warrants exercisable term                                   3 years      
Sublease Agreement [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Lease expiration                             Jan. 31, 2020            
Security deposit                             $ 13            
Sublease Agreement [Member] | First 12-Month Period [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Monthly rent                             6            
Sublease Agreement [Member] | After 12 Month Period Until Expiration [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Monthly rent                             7            
Prior to Sublease [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Monthly rent                             $ 4            
Two Management Agreements [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Number of bitcoin mining machines purchased | Integer                     2,376                    
Purchase of assets                     $ 3,650                    
Other payables                     $ 691                    
User distribution portion description                     The User Distribution Portion is 50% of the amount of Bitcoin mined net of the operating fee (10% of the total Bitcoin mined) and the electricity cost.                    
Management Agreements [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Stock issued during period shares | shares                                   436,100      
Due to related parties                                   $ 0 $ 0    
Management Agreement Termination [Member] | Buckhead Crypto [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Purchase of assets               $ 767                          
Prepaid expense               $ 133                          
Other Management Agreement [Member] | Third Party [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Number of bitcoin mining machines purchased | Integer                 200                        
Purchase of assets                 $ 428                        
POD5 Agreement [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Stock issued during period shares | shares 200,000                                        
Inducement expense $ 25                                        
Employment Agreement [Member] | Mr. Robert Lowrey [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Annual base salary           $ 240                              
One-time signing bonus           $ 10                              
Employment Agreement [Member] | Mr. Robert Lowrey [Member] | 2016 Stock Option Plan [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Number of restricted common stock issued | shares           750,000                              
Stock option vesting period           2 years                              
Employment Agreement [Member] | Mr. Ladd [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Annual base salary         $ 360                                
Employment Agreement [Member] | Mr. Ladd [Member] | 2016 Stock Option Plan [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Number of restricted common stock issued | shares         600,000                                
Stock option vesting period         2 years                                
Restated Executive Employment Agreement [Member] | Mr. Stephen Schaeffer [Member] | 2016 Stock Option Plan [Member]                                          
Operating Leases Commitments And Security Deposit [Line Items]                                          
Annual base salary     $ 250