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Merger - Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 10, 2019
USD ($)
$ / shares
shares
Sep. 09, 2019
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Preferred stock, dividend rate 0.1   0.1    
Temporary equity, par value (USD per share) | $ / shares $ 0.0001        
Preferred stock, par or stated value per share (USD per share) | $ / shares $ 0.0001   $ 0.0001 $ 0.0001  
Business acquisition, equity interest issued (in Shares) | shares 1,615,637        
Goodwill     $ 9,978 $ 1,745 $ 3,491
Business combination, acquisition related costs     2,342 $ 0  
ATRM Holdings, Inc.          
Business Acquisition [Line Items]          
Business acquisition, equity interest issued (in Shares) | shares 1,600,000.0        
Recognized identifiable assets ATRM acquired     17,452    
Business acquisition share price (in per share) | $ / shares $ 10.00        
Goodwill     8,233    
Business combination, recognized identifiable assets acquired and liabilities assumed, intangible assets, other than goodwill $ 19,470   $ 19,470    
Series A Preferred Stock          
Business Acquisition [Line Items]          
Digirad shares issued per ATRM shares ( in Shares)   0.03      
Series A Preferred Stock | ATRM Holdings, Inc.          
Business Acquisition [Line Items]          
Digirad shares issued per ATRM shares ( in Shares) 0.03        
Business acquisition, equity interest issued (in Shares) | shares 1,615,637        
Series B Preferred Stock | ATRM Holdings, Inc.          
Business Acquisition [Line Items]          
Digirad shares issued per ATRM shares ( in Shares) 2.5 2.5      
ATRM Holdings, Inc.          
Business Acquisition [Line Items]          
Preferred stock, dividend rate percentage 10.00%        
Preferred stock, par or stated value per share (USD per share) | $ / shares $ 0.001