Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Lease Income	$ 1,824	$ 2,836	$ 6,646	$ 7,661
Total revenues	30,353	28,333	81,552	78,043
Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21,166	23,656	59,620	70,543
Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,187	4,677	21,932	7,500
Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17,978	19,416	48,756	58,096
Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	540	1,682	2,553	3,980
Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,508	1,669	4,689	5,576
Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	20,026	22,767	55,998	67,652
Total revenues	21,794	25,596	62,441	75,306
Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8,486	2,722	18,858	2,722
Total revenues	8,542	2,729	19,061	2,729
Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17	8	50	8
Total revenues	17	8	50	8
Diagnostic Services
Disaggregation of Revenue [Line Items]
Lease Income	121	194	484	505
Total revenues	10,711	11,670	28,665	35,714
Diagnostic Services | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,711	11,670	28,665	35,714
Diagnostic Services | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Diagnostic Services | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,590	11,476	28,181	35,169
Diagnostic Services | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Diagnostic Services | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	40
Diagnostic Services | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,590	11,476	28,181	35,209
Diagnostic Services | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Diagnostic Services | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Diagnostic Imaging
Disaggregation of Revenue [Line Items]
Lease Income	0	0	0	0
Total revenues	2,048	3,351	7,242	8,923
Diagnostic Imaging | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,439	1,521	4,444	4,571
Diagnostic Imaging | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	609	1,830	2,798	4,352
Diagnostic Imaging | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Diagnostic Imaging | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	540	1,682	2,553	3,980
Diagnostic Imaging | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,508	1,669	4,689	4,943
Diagnostic Imaging | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,048	3,351	7,242	8,923
Diagnostic Imaging | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Diagnostic Imaging | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Mobile Healthcare
Disaggregation of Revenue [Line Items]
Lease Income	1,647	2,635	5,959	7,149
Total revenues	9,035	10,575	26,534	30,669
Mobile Healthcare | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8,959	10,458	26,308	30,251
Mobile Healthcare | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76	117	226	418
Mobile Healthcare | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,388	7,940	20,575	22,927
Mobile Healthcare | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Mobile Healthcare | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	593
Mobile Healthcare | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,388	7,940	20,575	23,520
Mobile Healthcare | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Mobile Healthcare | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Building and Construction
Disaggregation of Revenue [Line Items]
Lease Income	56	7	203	7
Total revenues	8,542	2,729	19,061	2,729
Building and Construction | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	57	7	203	7
Building and Construction | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8,485	2,722	18,858	2,722
Building and Construction | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Building and Construction | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Building and Construction | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Building and Construction | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Building and Construction | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8,486	2,722	18,858	2,722
Building and Construction | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Real Estate and Investments
Disaggregation of Revenue [Line Items]
Lease Income	0	0	0	0
Total revenues	17	8	50	8
Real Estate and Investments | Services and goods transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Real Estate and Investments | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17	8	50	8
Real Estate and Investments | Mobile Imaging
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Real Estate and Investments | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Real Estate and Investments | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Real Estate and Investments | Healthcare
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Real Estate and Investments | Building and Construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Real Estate and Investments | Real Estate and Investments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 17	$ 8	$ 50	$ 8