Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2020
Entity File Number	001-35947
Entity Registrant Name	DIGIRAD CORP
Entity Central Index Key	0000707388
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	33-0145723
Entity Address, Address Line One	1048 Industrial Court,
Entity Address, City or Town	Suwanee
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30024
City Area Code	858
Local Phone Number	726-1600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Outstanding (in shares)		4,759,701
Common Stock, par value $0.0001 per share
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	DRAD
Security Exchange Name	NASDAQ
Series A Cumulative Perpetual Preferred Stock, par value $0.0001 per share
Entity Information [Line Items]
Title of 12(b) Security	Series A Cumulative Perpetual Preferred Stock, par value $0.0001 per share
Trading Symbol	DRADP
Security Exchange Name	NASDAQ