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NOTES PAYABLE (Details) - USD ($)
2 Months Ended 6 Months Ended 12 Months Ended
Apr. 03, 2019
Oct. 04, 2016
Apr. 08, 2019
Feb. 23, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Apr. 01, 2019
Dec. 17, 2018
Dec. 14, 2018
Oct. 01, 2018
Nov. 20, 2017
Jun. 30, 2017
Line of Credit Facility [Line Items]                            
Notes payable         $ 3,485,000   $ 6,513,000              
Payment of overadvance         15,438,000 $ 15,984,000                
Annual review delivery period             105 days 105 days            
Gerber Finance Inc                            
Line of Credit Facility [Line Items]                            
Line of credit with maximum borrowing availability         4,000,000.0                  
KBS Loan Agreement                            
Line of Credit Facility [Line Items]                            
Notes payable, net         900,000                  
Revolving line of credit         4,000,000                  
Line of credit with maximum borrowing availability         $ 4,000,000                  
KBS Loan Agreement | Gerber Finance Inc                            
Line of Credit Facility [Line Items]                            
Annual facilities fee percentage         1.50%                  
Monthly collateral monitoring fee percentage         0.10%                  
KBS Loan Agreement | Prime Rate                            
Line of Credit Facility [Line Items]                            
Debt interest rate         2.75%                  
EBGL Loan Agreement                            
Line of Credit Facility [Line Items]                            
Notes payable         $ 2,600,000                  
Revolving line of credit         $ 3,000,000                  
Line of credit with maximum borrowing availability   $ 3,000,000.0                       $ 3,000,000
Automatic extension period   1 year                        
Initial line of credit availability   $ 1,000,000.0                        
Increase in EBGL Loan Agreement   3,000,000.0                        
Amount of line of credit increment   $ 500,000                        
Minimum debt service coverage ratio             100.00% 100.00%            
Audited financial statements delivery period             120 days 120 days            
EBGL Loan Agreement | Prime Rate                            
Line of Credit Facility [Line Items]                            
Debt interest rate                           1.50%
Basis spread on variable rate   2.75%                        
KBS Loan Agreement, Maturing February 22, 2019                            
Line of Credit Facility [Line Items]                            
Automatic extension period         1 year                  
KBS Loan Agreement, Maturing February 22, 2020                            
Line of Credit Facility [Line Items]                            
Automatic extension period         1 year                  
Director | Payment Guarantee                            
Line of Credit Facility [Line Items]                            
Guarantor obligation                 $ 600,000       $ 500,000  
Eight Amendment To Loan And Security Agreement | KBS Loan Agreement                            
Line of Credit Facility [Line Items]                            
Line of credit with maximum borrowing availability                       $ 600,000.0    
Debt instrument periodic payment       $ 75,000                    
Payment of overadvance $ 600,000                          
Promissory note payable to Gerber Finance                            
Line of Credit Facility [Line Items]                            
Debt instrument periodic payment     $ 75,000                      
Promissory Note | Digirad Unsecured Promissory Note, Issued December 12, 2018                            
Line of Credit Facility [Line Items]                            
Debt interest rate         10.00%                  
Debt principal amount         $ 300,000         $ 300,000 $ 300,000.0      
Minimum | Promissory Note | Digirad Unsecured Promissory Note, Issued December 12, 2018                            
Line of Credit Facility [Line Items]                            
Debt interest rate         10.00%           10.00%      
Maximum | Promissory Note | Digirad Unsecured Promissory Note, Issued December 12, 2018                            
Line of Credit Facility [Line Items]                            
Debt interest rate         12.00%           12.00%