Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Lease Income									$ 11,232	$ 10,756
Total Revenues	$ 36,142	$ 28,333	$ 25,798	$ 23,912	$ 25,928	$ 25,707	$ 27,080	$ 25,465	114,185	104,180
Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									94,584	94,894
Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									19,601	9,286
Mobile Imaging
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									77,782	81,559
Camera Sales
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									7,213	4,914
Camera Support
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									6,659	6,951
Healthcare Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									91,654	93,424
Total Revenues									102,846	104,180
Building and Construction
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									11,217	0
Total Revenues									11,257	0
Real Estate and Investments
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									82	0
Total Revenues									82	0
Diagnostic Services
Disaggregation of Revenue [Line Items]
Lease Income									1,192	562
Total Revenues									47,723	49,256
Diagnostic Services | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									47,723	45,862
Diagnostic Services | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	3,394
Diagnostic Services | Mobile Imaging
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									46,531	48,694
Diagnostic Services | Camera Sales
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Diagnostic Services | Camera Support
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Diagnostic Services | Healthcare Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									46,531	48,694
Diagnostic Services | Building and Construction
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Diagnostic Services | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Diagnostic Imaging
Disaggregation of Revenue [Line Items]
Lease Income									0	118
Total Revenues									13,872	11,983
Diagnostic Imaging | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									6,090	6,555
Diagnostic Imaging | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									7,782	5,428
Diagnostic Imaging | Mobile Imaging
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Diagnostic Imaging | Camera Sales
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									7,213	4,914
Diagnostic Imaging | Camera Support
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									6,659	6,951
Diagnostic Imaging | Healthcare Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									13,872	11,865
Diagnostic Imaging | Building and Construction
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Diagnostic Imaging | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Mobile Healthcare
Disaggregation of Revenue [Line Items]
Lease Income									10,000	10,076
Total Revenues									41,251	42,941
Mobile Healthcare | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									40,731	42,477
Mobile Healthcare | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									520	464
Mobile Healthcare | Mobile Imaging
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									31,251	32,865
Mobile Healthcare | Camera Sales
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Mobile Healthcare | Camera Support
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Mobile Healthcare | Healthcare Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									31,251	32,865
Mobile Healthcare | Building and Construction
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Mobile Healthcare | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Building and construction
Disaggregation of Revenue [Line Items]
Lease Income									40	0
Total Revenues									11,257	0
Building and construction | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									40	0
Building and construction | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									11,217	0
Building and construction | Mobile Imaging
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Building and construction | Camera Sales
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Building and construction | Camera Support
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Building and construction | Healthcare Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Building and construction | Building and Construction
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									11,217	0
Building and construction | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Real Estate And Investments
Disaggregation of Revenue [Line Items]
Lease Income									0	0
Total Revenues									82	0
Real Estate And Investments | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Real Estate And Investments | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									82	0
Real Estate And Investments | Mobile Imaging
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Real Estate And Investments | Camera Sales
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Real Estate And Investments | Camera Support
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Real Estate And Investments | Healthcare Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Real Estate And Investments | Building and Construction
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									0	0
Real Estate And Investments | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Healthcare Revenue from Contracts with Customers									$ 82	$ 0