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Related Party Transaction (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 10, 2021
Sep. 10, 2019
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 05, 2020
Mar. 29, 2019
Related Party Transaction [Line Items]              
Common stock, outstanding (in shares)     15,029,410 5,805,916      
Related party notes         $ 2.3    
Board of Directors Chairman              
Related Party Transaction [Line Items]              
Guarantor obligations, maximum exposure, undiscounted           $ 0.5 $ 1.5
Board of Directors Chairman | Digirad Corporation              
Related Party Transaction [Line Items]              
Common stock, outstanding (in shares)     1,958,227        
Percentage of outstanding shares (percent)     13.03%        
Preferred stock, outstanding (in shares)     1,289,772        
ATRM Holdings, Inc. | Board of Directors Chairman              
Related Party Transaction [Line Items]              
Number of preferred stock shares acquired (in shares)   100,000          
Share price (in dollars per share)   $ 10.00          
Consideration transferred   $ 1.0          
Private Placement | Board of Directors Chairman              
Related Party Transaction [Line Items]              
Number of shares issued in transaction (in shares) 650,000            
Price of stock sold (in usd per share) $ 3.25            
ATRM Unsecured Promissory Note, Due January 12, 2020              
Related Party Transaction [Line Items]              
Related party notes         $ 0.7    
ATRM Unsecured Promissory Note, Due January 12, 2020 | Notes Payable, Other Payables | Minimum              
Related Party Transaction [Line Items]              
Stated rate (percent)         10.00%    
ATRM Unsecured Promissory Note, Due January 12, 2020 | Notes Payable, Other Payables | Maximum              
Related Party Transaction [Line Items]              
Weighted average interest rate (percent)         12.00%    
ATRM Unsecured Promissory Note, Due June 1, 2020              
Related Party Transaction [Line Items]              
Related party notes         $ 1.2    
ATRM Unsecured Promissory Note, Due June 1, 2020 | Notes Payable, Other Payables | Minimum              
Related Party Transaction [Line Items]              
Stated rate (percent)         10.00%    
ATRM Unsecured Promissory Note, Due June 1, 2020 | Notes Payable, Other Payables | Maximum              
Related Party Transaction [Line Items]              
Weighted average interest rate (percent)         12.00%    
ATRM Unsecured Promissory Note, Due November 30, 2020              
Related Party Transaction [Line Items]              
Related party notes         $ 0.4    
ATRM Unsecured Promissory Note, Due November 30, 2020 | Notes Payable, Other Payables | Minimum              
Related Party Transaction [Line Items]              
Stated rate (percent)         10.00%    
ATRM Unsecured Promissory Note, Due November 30, 2020 | Notes Payable, Other Payables | Maximum              
Related Party Transaction [Line Items]              
Weighted average interest rate (percent)         12.00%