Basis of Presentation and Significant Accounting Policies - Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$ 197	$ 204
ATRM beginning balance	60	0
Charges to cost of revenues	547	279
Applied to liability	(383)	(286)
Balance at end of year	$ 421	$ 197
Diagnostic Imaging
Warranty [Line Items]
Standard product warranty period	12 months
Building and construction
Warranty [Line Items]
Standard product warranty period	12 months
Building and Construction - EBGL
Warranty [Line Items]
Standard product warranty period	25 years