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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 30 Months Ended
Mar. 29, 2019
Feb. 26, 2019
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]            
Preferred stock, shares authorized (in shares)         2,000,000 2,000,000
Subsequent Event            
Subsequent Event [Line Items]            
Proceeds from issuance of subordinated convertible promissory notes $ 1,700          
Weighted average stock price (in dollars per share) $ 0.20          
Interest rate on convertible notes     5.00% 10.00%    
Series A Preferred Stock | Subsequent Event            
Subsequent Event [Line Items]            
Preferred stock, shares authorized (in shares) 2,000,000          
Energy Focus, Inc. | Subsequent Event            
Subsequent Event [Line Items]            
Ownership position   17.60%        
James Tu Through Fusion Park LLC | Subsequent Event            
Subsequent Event [Line Items]            
Proceeds from issuance of subordinated convertible promissory notes   $ 580        
Brilliant Start Enterprise, Inc. | Subsequent Event            
Subsequent Event [Line Items]            
Proceeds from issuance of subordinated convertible promissory notes   $ 500