Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Lease Income	$ 2,702	$ 2,310
Total revenues	28,857	23,912
Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21,959	22,802
Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,898	1,110
Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17,863	19,079
Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,339	804
Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,522	1,719
Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	20,724	21,602
Total revenues	23,342	23,912
Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,400	0
Total revenues	5,484	0
Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31	0
Total revenues	31	0
Diagnostic Services
Disaggregation of Revenue [Line Items]
Lease Income	212	141
Total revenues	10,814	11,726
Diagnostic Services | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,814	11,726
Diagnostic Services | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Diagnostic Services | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,602	11,585
Diagnostic Services | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Diagnostic Services | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Diagnostic Services | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,602	11,585
Diagnostic Services | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Diagnostic Services | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Diagnostic Imaging
Disaggregation of Revenue [Line Items]
Lease Income	0	0
Total revenues	2,861	2,523
Diagnostic Imaging | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,487	1,551
Diagnostic Imaging | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,374	972
Diagnostic Imaging | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Diagnostic Imaging | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,339	804
Diagnostic Imaging | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,522	1,719
Diagnostic Imaging | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,861	2,523
Diagnostic Imaging | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Diagnostic Imaging | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Mobile Healthcare
Disaggregation of Revenue [Line Items]
Lease Income	2,406	2,169
Total revenues	9,667	9,663
Mobile Healthcare | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,574	9,525
Mobile Healthcare | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	93	138
Mobile Healthcare | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,261	7,494
Mobile Healthcare | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Mobile Healthcare | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Mobile Healthcare | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,261	7,494
Mobile Healthcare | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Mobile Healthcare | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	$ 0
Building and Construction
Disaggregation of Revenue [Line Items]
Lease Income	84
Total revenues	5,484
Building and Construction | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	84
Building and Construction | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,400
Building and Construction | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Building and Construction | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Building and Construction | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Building and Construction | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Building and Construction | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,400
Building and Construction | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Real Estate and Investments
Disaggregation of Revenue [Line Items]
Lease Income	0
Total revenues	31
Real Estate and Investments | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Real Estate and Investments | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31
Real Estate and Investments | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Real Estate and Investments | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Real Estate and Investments | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Real Estate and Investments | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Real Estate and Investments | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Real Estate and Investments | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 31