Document And Entity Information - shares
3 Months Ended
Mar. 31, 2018
Apr. 24, 2018
Document And Entity Information [Abstract]    
Entity Registrant Name DIGIRAD CORP  
Entity Central Index Key 0000707388  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Outstanding (in shares)   20,119,118