SUBSEQUENT EVENTS - Merger with Digirad Corporation (Details)	Sep. 10, 2018	Jul. 01, 2019 USD ($) shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 17, 2018 USD ($)
Subsequent Event [Line Items]
Common stock, shares outstanding (in shares) | shares			2,466,219	2,466,219
Total long-term debt			$ 5,197,000	$ 5,161,000
ATRM Holdings, Inc. | Jeffrey E. Eberwein | Subsequent Event
Subsequent Event [Line Items]
Percentage of outstanding shares		17.40%
Digirad Corporation | Jeffrey E. Eberwein | Subsequent Event
Subsequent Event [Line Items]
Percentage of outstanding shares		4.30%
Common stock, shares outstanding (in shares) | shares		869,152
LSVI | Subsequent Event
Subsequent Event [Line Items]
Pledge as collateral		$ 3,000,000
Series B Cumulative Preferred Stock | LSVI | ATRM Holdings, Inc. | Subsequent Event
Subsequent Event [Line Items]
Common stock, shares outstanding (in shares) | shares		222,577
Series B Cumulative Preferred Stock | LSV Co-Invest I | ATRM Holdings, Inc. | Subsequent Event
Subsequent Event [Line Items]
Common stock, shares outstanding (in shares) | shares		374,562
LSV Co-Invest I Promissory Notes | Promissory Note
Subsequent Event [Line Items]
Total long-term debt			1,500,000
LSV Co-Invest I Promissory Notes | Promissory Note | Subsequent Event
Subsequent Event [Line Items]
Total long-term debt		$ 1,400,000
Lone Star Value Management, Unsecured Promissory Note, Issued December 17, 2018 | Promissory Note
Subsequent Event [Line Items]
Total long-term debt			300,000	$ 300,000
Debt principal amount			$ 300,000		$ 300,000.0
Lone Star Value Management, Unsecured Promissory Note, Issued December 17, 2018 | Promissory Note | Subsequent Event
Subsequent Event [Line Items]
Debt principal amount		$ 300,000.0
ATRM Holdings, Inc. | Digirad Corporation
Subsequent Event [Line Items]
Consideration issue in business acquisition, number of shares issued per share of common stock owned	0.4