Basis of Presentation and Significant Accounting Policies - ATRM Merger and Mezzanine equity (Details)			12 Months Ended
	Sep. 10, 2019 $ / shares shares	Sep. 09, 2019	Dec. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares
Business Acquisition [Line Items]
Preferred stock, dividend rate	0.1		0.1
Preferred stock, par or stated value per share (USD per share) | $ / shares	$ 0.0001		$ 0.0001	$ 0.0001
Business acquisition, equity interest issued	1,615,637
ATRM Holdings, Inc.
Business Acquisition [Line Items]
Business acquisition, equity interest issued	1,600,000.0
Series A Preferred Stock
Business Acquisition [Line Items]
Equity interests issued (per share)		0.03
Series A Preferred Stock | ATRM Holdings, Inc.
Business Acquisition [Line Items]
Equity interests issued (per share)	0.03
Business acquisition, equity interest issued	1,615,637
Series B Preferred Stock | ATRM Holdings, Inc.
Business Acquisition [Line Items]
Equity interests issued (per share)	2.5	2.5
ATRM Holdings, Inc.
Business Acquisition [Line Items]
Preferred stock, par or stated value per share (USD per share) | $ / shares	$ 0.001
Preferred stock, dividend rate percentage	10.00%