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Debt - Digirad Loan Agreements (Details) - USD ($)
12 Months Ended
Mar. 29, 2019
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Loss on extinguishment of debt   $ 151,000 $ 43,000
Letter of Credit | Revolving Credit Facility | Sterling National Bank      
Debt Instrument [Line Items]      
Aggregate amount   100,000  
Credit Facility Due March 2024 | Line of Credit | Revolving Credit Facility | Sterling National Bank      
Debt Instrument [Line Items]      
Credit facility term 5 years    
Maximum credit amount $ 20,000,000    
Aggregate amount $ 500,000    
Borrowing availability   3,000,000  
Loss on extinguishment of debt   $ 200,000  
Credit Facility Due March 2024 | Line of Credit | Revolving Credit Facility | Sterling National Bank | LIBOR      
Debt Instrument [Line Items]      
Stated rate 2.50%    
Additional margin rate 2.25%    
Board of Directors Chairman      
Debt Instrument [Line Items]      
Guarantor obligations, maximum exposure, undiscounted $ 1,500,000.0