Merger - Schedule of Cash Flow Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 10, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Number of shares issued (in Shares)	1,615,637
ATRM Holdings, Inc.
Business Acquisition [Line Items]
Number of shares issued (in Shares)	1,600,000.0
Issuance of Digirad Series A Cumulative Perpetual Preferred Stock (1,615,637 shares)	$ 16,156	$ 0
Settlement of pre-existing note receivable between DRAD and ATRM	296	0
Fair value of pre-existing joint venture settlement between DRAD and ATRM	$ 1,000	$ 0
Series A Preferred Stock | ATRM Holdings, Inc.
Business Acquisition [Line Items]
Number of shares issued (in Shares)	1,615,637