Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Consolidated revenue	$ 22,342	$ 25,798	$ 51,199	$ 49,710
Consolidated gross profit	4,026	5,004	8,467	8,985
(Loss) income from operations by segment	(1,526)	(1,146)	(4,130)	(2,281)
Segment loss from operations	(1,526)	(146)	(4,130)	(1,281)
Merger and finance costs	0	(1,000)	0	(1,000)
Total depreciation and amortization	2,374	1,851	4,782	3,660
Diagnostic Services
Segment Reporting Information [Line Items]
Consolidated revenue	7,140	12,318	17,954	24,044
Total depreciation and amortization	307	305	637	609
Diagnostic Imaging
Segment Reporting Information [Line Items]
Consolidated revenue	2,333	3,049	5,194	5,572
Total depreciation and amortization	66	73	129	151
Mobile Healthcare
Segment Reporting Information [Line Items]
Consolidated revenue	7,832	10,431	17,499	20,094
Total depreciation and amortization	1,364	1,438	2,742	2,865
Building and Construction
Segment Reporting Information [Line Items]
Consolidated revenue	5,035		10,519
Total depreciation and amortization	571	0	1,143	0
Real Estate and Investments
Segment Reporting Information [Line Items]
Consolidated revenue	2		33
Total depreciation and amortization	66	35	131	35
Operating Segments | Diagnostic Services
Segment Reporting Information [Line Items]
Consolidated revenue	7,140	12,318	17,954	24,044
Consolidated gross profit	953	2,805	2,958	5,386
(Loss) income from operations by segment	515	1,957	1,539	3,693
Operating Segments | Diagnostic Imaging
Segment Reporting Information [Line Items]
Consolidated revenue	2,333	3,049	5,194	5,572
Consolidated gross profit	1,232	1,080	2,101	1,866
(Loss) income from operations by segment	934	565	1,455	908
Operating Segments | Mobile Healthcare
Segment Reporting Information [Line Items]
Consolidated revenue	7,832	10,431	17,499	20,094
Consolidated gross profit	851	1,296	2,050	1,910
(Loss) income from operations by segment	135	439	312	(184)
Operating Segments | Building and Construction
Segment Reporting Information [Line Items]
Consolidated revenue	5,035	0	10,519	0
Consolidated gross profit	1,053	0	1,456	0
(Loss) income from operations by segment	130	0	(729)	0
Operating Segments | Real Estate and Investments
Segment Reporting Information [Line Items]
Consolidated revenue	161	0	350	0
Consolidated gross profit	95	(177)	218	(177)
(Loss) income from operations by segment	10	(199)	116	(199)
Corporate And Reconciling Items
Segment Reporting Information [Line Items]
Consolidated revenue	(159)	0	(317)	0
Consolidated gross profit	(158)	0	(316)	0
(Loss) income from operations by segment	(158)	0	(316)	0
Segment Reconciling Items
Segment Reporting Information [Line Items]
(Loss) income from operations by segment	$ (3,092)	$ (2,908)	$ (6,507)	$ (5,499)